Summary
Four generations of minerals have been confirmed in an eclogite-bearing impure marble located at Yangguantun, Rongcheng county, eastern Shandong province, China in the eastern part of the collision zone between the Sino-Korean and Yangtze cratons.
(1) Early stage: high-Al-P-F titanite, pure zoisite and jadeite-bearing diopside occur as rounded aggregates surrounded by main stage amphiboles and titanites. (2) The main stage assemblage is characterized by hornblende (I), titanite (II), calcite, dolomite and phlogopite; they are intergrown with each other or occur as corona around the primary diopside, zoisite or titanite. (3) Earlier retrogression stage: hornblende (I) is replaced by hornblende (II) which occurs around hornblende (I). (4) Later retrogression stage: hornblende (II) is replaced by tremolite, chlorite and albite.
The early stage is correlated with the eclogitic facies, but the main, earlier retrogression and later retrogression stages reflect retrogressions of eclogitic marble at different depth during decompression. The high pressure evidence and the metamorphic evolution of the marble studied, whose precursor was of crustal sedimentary affinity, indicate that the marble was subducted from the surface to great depth and then uplifted into the country rock gneiss, together with ultra-high-pressure eclogite and ultramafic rocks.
Zusammenfassung
Vier Mineralgenerationen werden in unreinen, Eklogit-führenden Marmoren aus Yangguantun, Rongcheng, in der östlichen Shangdong Provinz Chinas unterschieden. Diese Gesteine sind im östlichen Teil der Kollisionszone zwischen dem Sino- koreanischen und dem Yangtze Kraton aufgeschlossen.
(1) Frühes Metamorphosestadium: Hoch-Al-P-F-Titanit, reiner Zoisit und Jadeitführender Diopsid kommen als rundliche Aggregate, die von Amphibolen der Hauptphase und Titanit umwachsen werden, vor. (2) Die Paragenese der metamorphen Hauptphase ist durch Hornblende (I), Titanit (II), Calcit, Dolomit und Phlogopit charakterisiert. Diese Minerale sind eng miteinander verwachsen und bilden Koronartexturen um primären Diopsid, Zoisit und Titanit. (3) Frühes retrogrades Metamorphosestadium: Hornblende (I) wird von Hornblende (II), die sich um Hornblende (I) ausbildet, verdrängt. (4) Spätes retrogrades Metamorphosestadium: Hornblende (II) wird durch Tremolit, Chlorit und Albit verdrängt.
Das frühe Stadium wird mit der Eklogitfazies, das Haupt- und die anschließenden retrograden Stadien werden mit der retrograden Metamorphose dieser eklogitischen Marmore in unterschiedlichen Tiefen infolge von Dekompression korreliert. Die hohen Drucke und die Entwicklungsgeschichte der untersuchten Marmore, die sich von krustalem sedimentären Material ableiten, belegen, daß die Subduktion dieses Materials von der Oberfläche in große Tiefen und der anschließende “Uplift” in die umgebenden Gneise, gemeinsam mit der Ultra-Hochdruckmetamorphose der Eklogite und ultramafischer Gesteine erfolgt sein muß.
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Ye, K., Hirajima, T. High-pressure marble at Yangguantun, Rongcheng County, Shandong Province, eastern China. Mineralogy and Petrology 57, 151–165 (1996). https://doi.org/10.1007/BF01162356
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DOI: https://doi.org/10.1007/BF01162356