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The Santa Fe Intrusion and Other Magmatic Bodies Under the Chichón Volcano Area (Mexico): Inferences from Aeromagnetic and New Petrologic-Geochronologic Data

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Abstract

We review the current knowledge of the Pleistocene Modern Chiapanecan Volcanic Arc (MCVA). This arc is related to the subduction of the Cocos plate beneath the North American plate in the State of Chiapas, southeastern Mexico. The MCVA consists of large intrusive bodies, domes, eroded volcanic landforms, and the active El Chichón, which produced the disastrous 1982 eruption, the deadliest in Mexico’s recorded history. The available geological knowledge, and new geological and aeromagnetic data on the arc, reveals a system composed of a sizeable intrusive body called the Santa Fe diorite, and small-size volcanoes such as El Chichón and Catedral, and extinct volcanoes associated with volcaniclastic deposits. A 3D-inversion of the aeromagnetic anomalies indicates that the Santa Fe diorite is a large intrusive body (27 km long, 4 km wide with a minimum volume of 1662 km3) while small volcanoes such as El Chichón have small-size magma chambers (~ 7 km3). Interestingly, our models of the causative bodies for the aeromagnetic anomalies suggest that the El Chichón volcano, as well as of other volcanic areas in the region, are not linked directly to the Santa Fe intrusive. However, new 40Ar/39Ar dates for samples from the Santa Fe intrusive (2.2 Ma), the Catedral volcano (1.6 Ma), and a mafic enclave (1.09 Ma) hosted in 1982 Chichón deposits, along with the aeromagnetic anomalies and geochemical data confirm that these extrusive and intrusive structures belong to the MCVA. The chemistry of these structures suggests that magmas generated in the upper mantle by the subduction system evolved through different processes, such as crustal contamination for the Santa Fe diorite and Catedral volcano, and crystal fractionation for El Chichón volcano.

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Acknowledgements

We thank F. García for his technical support during the laboratory analyses and G. Cisneros for his support during image processing and some map generation. We are also grateful to Dr. Robert I. Tilling and two anonymous reviewers for their constructive comments, which greatly improved the original manuscript.

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Appendices

Appendix 1

1.1 Whole-Rock Geochemical Analysis

We collected three samples from structures that to our knowledge had not been analyzed before. One of the samples was collected from an intrusive body (MCH516) that correlates with rocks of the Santa Fe mining district described by Damon and Montesinos (1978), which are defined here as Santa Fe Intrusive. The second sample is a block (MCH505B) from the Catedral volcanoclastic fan, and the third is a mafic enclave (CH0902E) hosted in an andesitic block of El Chichón volcano. These three samples were collected for petrographic and geochemical analysis and 40Ar/39Ar dating.

1.2 X-Ray Fluorescence (XRF) Analysis

The XRF analyses of major and some trace elements (Rb, Sr, Ba, Y, Zr, Nb, V, Cr, Co, Ni, Cu, Zn, Th, and Pb) have precisions of < 1% for all elements (Table 1). These analyses were carried out at the Laboratorio Nacional de Geoquímica y Mineralogía, UNAM, México, following the methodology described in Lozano-Santacruz and Bernal (2005). Trace elements were determined by inductively coupled plasma mass spectrometry, at the Laboratorio de Estudios Isotópicos (LEI) UNAM, using a Thermo Series XII spectrometer, following Mori et al. (2007).

1.3 Sr, Nd, and Pb Isotopic Analysis

The Sr, Nd, and Pb isotopic analyses of selected samples were carried out at the Jackson School of Geosciences, University of Texas at Austin, USA, using a Thermo Triton TI thermal ionization mass spectrometer (TIMS), following standard procedures on whole-rock chips (Table 1). Groundmass chips that lacked visible alteration or phenocrysts were handpicked under a binocular microscope. Chips were first leached in hot 6 N HCl to remove any caliche or weathered material and then digested in HF:HNO3. Sr, Nd, and Pb were extracted and purified following standard procedures after Lassiter et al. (2003). Sr-Spec, REE-spec/HDEHP, and AG1-X8 resins were used to separate Sr, Nd, and Pb, respectively.

Measurements were carried out in manual and programme modes and included two total procedural blanks and two sample duplicate analyses. Sr was loaded on single Re filaments with Ta2O5; mass fractionation of 87Sr/86Sr ratios was corrected using 88Sr/86Sr = 8.375209. Neodymium was run as metal on double Re filaments. 143Nd/144Nd ratios were corrected for mass fractionation using 146Nd/144Nd = 0.7219. During the course of this study, 32 analyses of Sr standard NBS 987 yielded a value of 0.710263 ± 9 (2σ). An in-house UT Ames Nd standard yielded a 143Nd/144Nd = 0.512069 ± 6 (2σ). Pb-isotope analyses were corrected for mass fractionation using a double-spike technique modified from Hamelin et al. (1985), House and McMahon (2000). Seven double-spiked fractionation corrected NBS 981 analysis carried out in this study yielded mean Pb isotopic ratios of:

$$\begin{aligned}^{206} {\text{Pb}}/^{204} {\text{Pb}}\, = \,16.9336 \, \pm \, 0.0048 \hfill \\^{207} {\text{Pb}}/^{204} {\text{Pb}}\, = \,15.4887 \, \pm \, 0.0063 \hfill \\^{208} {\text{Pb}}/^{204} {\text{Pb}}\, = \,36.6907 \, \pm \, 0.0207 \hfill \\ \end{aligned}$$

1.4 40Ar/39Ar Analysis

The samples were dated with the 40Ar/39Ar method used at the University of Alaska Fairbanks geochronology laboratory by laser step-heating of phenocryst-free groundmass chips (1 to 0.5 mm size fraction) following the procedures outlined in Layer (2000) and Layer et al. (2009). The mineral TCR-2 with an age of 28.6 Ma (Renne et al. 2010) was used to monitor neutron flux and calculate the irradiation parameter, J, for all samples. The measured argon isotopes were corrected for system blank and mass discrimination, and for the irradiated samples, calcium, potassium, and chlorine interference reactions, following the procedures of McDougall and Harrison (1999). Ages were calculated using the constants of Renne et al. (2010) and are reported at the 1-sigma level. Typical full-system, fifteen-minute laser blank values (in moles) were generally 6 × 10–16 mol 40Ar, 3 × 10–18 mol 39Ar, 3 × 10–18 mol 38Ar and 1 × 10–17 mol 36Ar, which are 10 to 50 times smaller than the sample/standard volume fractions. Mass discrimination was monitored by running calibrated air shots. The mass discrimination during this method was 1.0% per mass unit. Two runs of each sample were done, and the most precise run was chosen for presentation and discussion. A sample is considered to have defined a plateau age if it has 3 or more contiguous fractions constituting at least 50% 39Ar release and is significant at the 95% confidence level (as indicated by a Mean Square Weighted Deviates; MSWD < ~ 2.5). For the two samples analyzed, plateau ages yielded the most interpretable results due to little isotopic variation between the steps. The results are quoted to the ± 1 sigma level and calculated using the constants of Steiger and Jaeger (1977). The results are given in Table 2.

Appendix 2

Detailed information and attributes of the eight aeromagnetic domains (AMDs) recognized from this study in the RPMF (Fig. 7a); additional information is given in Table 4.

AMD I This domain is located in the central portion of the study zone and is characterized by a dipolar anomaly of large extent spanning, ~ 52 km in the N–S direction and ~ 40 km in the E–W direction. The magnetic high is elongated in the NNE–SSW direction with a length of ~ 27 km and ~ 24 km in the E–W direction. The magnetic low runs for ~ 37 km along the E–W direction and is ~ 19 km in the N–S direction. The anomaly is associated with a large granodioritic-dioritic intrusion cropping out around the central portion of the anomaly. In the surrounding areas, the anomaly is associated with sedimentary rocks, mostly intercalations limestone-sandstone and limonite-limestone, except to the west where it is associated with andesite breccias and andesites from the El Chichón volcano complex.

AMD II comprises the area to the north, where it meets the edge of the study area, and diffuses into nearby areas of smaller magnetic field intensity, which we labeled as domains IIa and IIb.

AMD II is characterized by its large size (~ 152 km in the E–W direction and ~ 78 km in the N–S) and seems to be associated with a magnetic high toward the N, beyond the study area. The anomaly has a somewhat slant L-shaped form. The magnetic high has gradients that increase at a rate of 0.00257 nT/m from S to N, 0.0051 nT/m from the west to the center, and 0.00078 nT/m from the center to the east. The topography in this area varies from 619 masl to the S to 25.5 masl to the N. It correlates with shale-limestone to the center and west, with shales-sandstones to the S, sandstone-polymictic conglomerates to the N, and alluvium and andesitic breccias to the E.

AMD IIa is found south of AMD II, it is elongated in an NW–SE trend measuring approximately 54 km, and 30 km in the NE–SW direction. Its magnetic intensity shows values between − 163 nT and − 112 nT, with an average of − 129 nT. Its topography varies from 230 1273 masl, with an average of 339 masl, and 230 masl toward the NW to the center, after that increasing to reach 1273 masl at the center and 552 masl to the SE. Geologically, it correlates with limestones-shales, limestones-dolomites, alluvium, and limonite-sandstone around the center.

AMD IIb lies to the east of AMD II and is characterized by similar magnetic field intensity to AMD IIa, with a gradient of only 0.00068 nT/m. It has an irregular elongated shape toward the S, and narrows toward the N. It is geologically associated with limestone-sandstones to the S and sandstones-shales to the N. The topography increases from 5 masl to the north to 189 to the south, but it reaches an altitude of about of 665 masl somewhere between the center and the south.

AMD III is located to the E and SE of AMD I and extends for 86 km to the NW–SE. A minor axis oriented NW–SE has a length of about 33 km. Magnetically it shows low values ranging from − 266 to − 206 nT, with a mean value of − 224 nT. Geologically, most of the domain correlates sandstones-shales and outcropping shales-limestones. The altitudes in the domain vary from 281 to 1882 masl to the SE, 1288 masl to the NW (where it meets AMDI) and 281 masl in the center.

AMD IV is a domain defined in three separated zones, two of them neighboring AMD III. They are banded with the long axis striking roughly NW–SE. The three sections are described in the following sub-domains.

AMD IVa comprises the south-center of the area, with a length of 41 km and a width of 23 km in the NE–SW direction. Magnetically, it shows a discrete gradient from NE to SW, going from − 200 to − 158 nT, with a variation of 0.0019 nT/m. It is associated with dolomites and alluvium. Topographically, it varies from 119 to 2073 masl, with an average of 1545 masl, the lowest values in the central portion and the highest in the NE.

AMD IVb is located in the NE portion of the zone, in the vicinity of AMD IIb and III. It has a length of the order of 68 km and 23 km in the perpendicular direction. Toward the NW portion, in the limits with the AMD II, it shows some small anomalies with magnetization intensities averaging 7.4 nT (157.3 to 164.7 nT) with a horizontal gradient of 0.0064 nT/m, and 12.8 nT (156.9 to 169.7 nT) with a horizontal gradient of 0.010 nT/m, respectively. In the NW–SE direction the domain presents magnetization intensity values ranging from − 186.3 to − 127.3 nT, with an average of − 172.4 nT. With the exception of the NW portion, where the small anomalies appear, the section shows two groups of intensities: one toward the NW central portion with values from − 169.2 to − 156.7 nT (with altitudes ranging from 1151 to 929 masl), and another from the center to the SE with values of − 183 to − 164.4 nT and a gradient of 0.0005 nT/m. Topographically, it exhibits two morphologies: one in the NW portion, running from 11.5 to 190.7 masl, and another one from the center to the NE going from 1158 to 1595 masl with an average of 1189 masl.

The NE–SW section of this domain presents magnetization intensities ranging from − 205 to − 140 nT, decreasing toward the NW and increasing to the NE, and a horizontal gradient of 0.00276 nT/m. The relief shows two morphologies, one from center to the NW of 272 masl to 1537 masl, with an average of 1032 masl, and another from center toward the NE from 272 to 34.3 m, with an average of 145 masl. The surface rocks are fundamentally shale-limestone, limestone-sandstone, and alluvium.

AMD IVc is defined by the SW portion of the study area and bounded by AMDs II and IIa to the NE and E, respectively, by AMD VII to the SW, and by AMD VIII to the NW. It is elongated, inclined toward the NW and consists of a long and wide section and two branches, one trending roughly N–S, and the second to the west. Its dimensions are 77.5 km in the NW–SE direction, up to the intersection of the two branches. At about 3.3 km from the intersection, the N–S branch has a width of 6.8 km in the NE–SW direction. The west branch has a length of 12.3 km and a width of 3.9 km.

The long section of the domain presents variations in the intensity of magnetization ranging from − 212 to − 163.7 nT and a horizontal gradient of 0.00062 nT/m. The topography varies from 152 masl to the NW to 1239 masl to the SE. The intensity of magnetization in the N–S branch range from − 205 (SSE) to − 157.7 nT (NNW), with an average of − 176.4 nT. The topography varies from 6 to 416 masl from the NNW to the SSE. The western branch spans 10 km and ranges in its magnetization intensity from − 190 to − 181 nT. Topographically, it has heights of 770 to 965 masl, which increase toward the west.

AMD V is located near the SE, in the vicinity of AMDs III, IVa and VI. It is cut off to the S by the limit of the study area and is characterized by a series of magnetic anomalies with a preponderance of magnetic lows. It has an amorphous shape, although somewhat elongated in the north direction with a length of 31.6 km. In the E–W direction, it varies from 36 km in the southern part to 20 km in the northern portion.

The anomalies have different intensities of magnetization; one shows an amplitude of 175.4 nT (varying from − 119.6 to − 295 nT) with a polar distance of 395 m. A second one has an intensity of 221.4 nT (− 130.1 to − 351.5 nT) with a polar distance of 5300 m. The topography changes from 1356 to 2383 masl from the SW to the NE. Geologically, the domain is associated with limestones-shales, and limonites-sandstones; the anomalies, however, are correlated with andesitic tuffs.

AMD VI is located in the southern part of the area and is incomplete as it is cut by the edge of the study area. It is elongated with a length of 21 km in NW–SE direction, and 10.7 km, wide. Magnetically it is a monopole with a magnetic high of 134 nT (− 158.6 nT at − 24.7 nT). The magnetic intensity in the domain ranges from − 180.1 to − 24.7 nT. In the domain it is possible to observe part of another monopole, showing values up to 63 nT. The terrain presents heights going from 1049 to 1908 masl, increasing in intensity from NW to SE. The domain is associated with andesites-andesitic tuffs. The monopoles are interpreted as due to protuberances on an intrusion of basic to intermediate composition.

AMD VII is identified in the SW corner of the study area and is cut both to the south and west. It is elongated with a length of 57.4 km in the NW–SE direction and 40 km in the NE–SW direction. At the center and south part, it contains a succession of small anomalies resembling a stone pavement showing various magnetization amplitudes ranging from − 175.4 to − 6.8 nT. Individual intensities are: 15.2 nT (− 6.8 to 22 nT), 56.1 nT (− 119.3 to − 175.4 nT), 85.5 nT (− 17.7 to − 103.2 nT) with a polar distance of 1.7 km. The highs are aligned in an NW–SE direction. Altitudes in the area range from 353 to 1256 masl.

A profile in an NE–SW direction reveals a series of small anomalies with magnetization intensities of 204.1 nT (− 16.2 to − 220.3 nT) and a polar distance of 3.4 km. The magnetic low is associated with a lineament in the NW–SE direction. Other magnetic anomalies have amplitudes of the order of 59.7 nT (− 63.8 to − 123.5 nT) with a polar distance of 1.45 km and 17.2 nT (− 102.9 to − 120.1 nT). The zone of magnetic lows has an NW–SE trend and is associated with zones of weakness, faults and (or) fractures. Topographically, the altitude varies from 319 to 1397 masl, from NE to SW. The area contains andesitic breccias and tuffs to the SW, and limestones and dolomites to the NE.

AMD VIII is located toward the NW end of the study zone, where it is cut off by its north and west margins. It is elongated with a length of 63 km in the NNW-SSE direction and an average width of 13.4 km. The entire domain is characterized by values associated with magnetic lows shown in three subdomains. One is located in the NNW portion with values from − 255 to − 226 nT, averaging − 232 nT. It correlates topographically with values going from 6 to 89 masl, from NW to SE. The second subdomain with magnetization intensities from − 284 to − 252 nT can be identified in the central portion of the domain. Topographically, it ranges from 40 to 419 masl. A third subdomain reckons magnetization intensity values between − 263 and − 210 nT, with a horizontal gradient increasing to the SW of 0.0041 nT/m. Topographically, it varies from 209 to 828 masl, rising toward the SE. The domain is geologically associated mostly with shale and limestone-dolomite.

Appendix 3

Detailed information and attributes of the seven aeromagnetic domains (AMDs) recognized from the study of the 2nd Derivative in Z direction; additional information given in Table 5.

AMD I is located mostly in the central portion of the study area, it is elongated with an average length of 31 km in the N–S direction, and 20 km in length to the E–W direction. It encloses a magnetic high surrounded, except to the west limit, by magnetic lows (− 0.00255 × 10−2 to − 0.000742 × 10−2 nT). On the surface, it is associated with limestones-sandstones, and a small outcrop of intrusive granodiorite-diorite, which suggests the presence of a sizeable granodioritic body below.

AMD II comprises a good part of the study area. Its main location is somewhat west of the center and its shape is amorphous, formed by a series of magnetic highs and lows aligned in such a way that a preferential direction cannot be distinguished. Toward the W, the dominant direction is NW–SE; at the center and the NE the direction is E–W, and toward the S the direction is N–S. This series of magnetic highs and lows have wavelengths spanning from 1850 to 4100 m. The magnetic intensity values fall in the interval from 0.013 × 10−2 to − 0.02 × 10−2 nT. El Chichón volcano is located in this domain. Geologically most of the surface rocks are shales and limestones, but there are also outcrops of andesitic breccia. For a better description this AMD was divided into the following subdomains:

AMD IIa is a section located to the north of the study area and limited by its edge. It is elongated, approximately 65 km along the E–W direction, and approximately 11 km wide. It is characterized by a sequence of highs and lows, mainly with an NE–SW and E–W trends. Their magnetic values oscillate between − 0.002 × 10−2 nT and 0.0037 × 10−2 nT; their wavelengths between 1900 and 2950 m with an average of about 2250 m. Most of this subdomain is covered by alluvium, with some outcrops of andesitic breccias.

AMD IIb is located in the SW corner of the study area and is cut off by the margins to the south and west. It has, therefore, a triangular shape with maximum dimensions of 51 km in the NW–SE direction and 27 km in the NE–SW. Magnetically it shows the same characteristics as AMD II. It is arranged in a series of consecutive highs and lows, with a preferential NW–SE trend, and wavelengths of the order of 2000 m. The magnetic values are in the range − 0.00217 × 10−2 nT and 0.0037 × 10−2 nT. The area is composed of breccias and andesitic tuffs.

AMD IIc is an elongated area situated toward the NW of the study area. With dimensions of 44 km to the NW–SE and 15 km to the NE–SW directions, it is cut off to the west by the study area´s edge. Magnetically, it is similar to other parts of the domain, consisting of stripes of magnetic highs and lows trending in the NW–SE direction. It shows magnetic values oscillating between − 0.00435 × 10−2 and 0.0023 × 10−2 nT, and terrain wavelengths of the order of 1800 m to 2, 325 m. The surface geology displays alluvium, sandstones-shales, shales-limestones and andesites-andesitic tuffs.

AMD III covers an almost square region to the east of the study area. Its dimensions are 73 km and 67 km in the in the E-W and N-S directions, respectively. Its shape is given by a series of banded highs trending NW–SE in a matrix of average values. The magnetic intensities vary between − 0.000430 × 10−2 nT and 0.000246 × 10−2 nT, and can be classified into three groups of different wavelengths, one of length 6.1 km topographically associated with elevations of 854 to 975 masl, another one of 7.9 nT with altitudes that go from 414 to 731 masl, and a third one of 9 km in length with height going from 1155 to 1336 masl. Most of the area of the domain contains sedimentary rocks: shales-limestones, limestones-sandstones, and limonites-sandstones. Around the center, however, there are mineral deposits.

AMD IV is composed of three sections: to the NW, NE and S of the study area, almost surrounding AMD II. These sections are cut off toward their NW, NE, E and S margins. It is characterized by showing a series of magnetic heights. The magnetic values range from − 0.00064 × 10−2 to 0.0013 × 10−2 nT in a setting of average values. There are high frequencies that can be classified into two groups: one with wavelengths from 1450 to 1550 m, another with wavelengths from 2050 to 2250 m. The NW portion of the domain has an area of 69 by 35 km in the E–W and N–S directions, respectively. The southern section is 40 km long in the N–S direction and 43 km along the E–W. The NE portion spans an area 35 km long along the N–S direction and 34 km along the E–W. Geologically, the NW part is associated with sandstones and polymictic conglomerates and shales-limestones. The NE part it is associated with limestones, sandstones, shales, and sandstones-limonites. The SW section is related to shales, limestones, and sandstones-shales.

AMD V is a somewhat elliptical domain is located in the SE, where it is cut off by the southern edge of the study area. Its dimensions are 61 and 2 km in the E–W and N–S directions, respectively. It is characterized by series of well-defined magnetic anomalies, showing evident bipolarity. Individual anomalies can be identified with values of 0.002988 × 10−2 nT and 0.001169 × 10−2 nT and polar distances of the order of 3.5 km. It contains wavelengths from 6450 to 7000 m. Geologically, it is associated with andesitic tuffs and sedimentary rocks, such as limestones, shales, and sandstones.

AMD VI is located toward the SW portion of the study area and is elongated with a long axis in the NW–SE direction, cut off in its extremes by the limits of the study area. It is 74 km in length along the NW–SE direction and, approximately 28 km wide. It shows bands of elongated magnetic highs of 34 km × 8.7 wide with values of up to 0.0006227 × 10−2 nT, embedded in a matrix with values ranging from − 0.00012 × 10−2 nT to − 0.00024 × 10−2 nT. It is related to limestones-dolomites, limestones-shales, and alluvium. See Table 2.

AMD VII is located toward the north central part of the studied área. It is limited to the W by AMD IV, to the E by AMD IIa and to the S by AMD II. It presents a shoe shape being elongated toward the W portion and in the NW–SE direction where it shows the dimensions of the order of the 26 km. See Table 2. Geologically it is correlates superficially with sandstones, polimictic conglomerate and with limestone-shale.

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López-Loera, H., Macías, J.L., Espíndola, J.M. et al. The Santa Fe Intrusion and Other Magmatic Bodies Under the Chichón Volcano Area (Mexico): Inferences from Aeromagnetic and New Petrologic-Geochronologic Data. Surv Geophys 41, 859–895 (2020). https://doi.org/10.1007/s10712-020-09591-8

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