Geologische Rundschau

, Volume 59, Issue 2, pp 686–724 | Cite as

Geochemistry of thermal metamorphic and granitization processes in the aureole rocks around Richughuta, Dt. Palamau, Bihar, India

  • N. C. Ghose
Aufsätze

Abstract

The Archaean metasediments represented by pelitic, semi-pelitic, calcareous and psammitic rocks around Richughuta have been thermally metamorphosed around a granite-granodiorite pluton. A detailed account of chemical and mineralogical studies from both the affected and unaffected representatives of the various rock units was carried out. It is found that the trend of chemical changes across the contact varies under similar physico-chemical conditions in different lithological set-up. Such a diversity in the thermal effect of the aureole rocks is caused due to the difference in chemical potential, geological setting, macro- and micro-structure of the affected rocks, nature of contact, prevailing vapour pressure and temperature in the system and lastly on the original silica content of the rock. The mechanism which controlled the migration of the cations was chiefly a two-way diffusion process and the history of the movement of cation changes, during the entire period of metamorphism.

Keywords

Silica Content Rock Unit Mineralogical Study Double Diffusion Thermal Metamorphic 

Zusammenfassung

Die archaischen Metasedimente, die in der Umgebung von Richughuta in Form von pelitischen, semipelitischen, kalkigen und psammitischen Gesteinen auftreten, sind um einen Granit-Granodiorit-Pluton thermo-metamorphisiert worden. Ein detaillierter Bericht über chemische und mineralogische Untersuchungen an den unveränderten und den veränderten Typen der verschiedenen Gesteinseinheiten wurde angefertigt. Es stellte sich heraus, daß die Neigung zu chemischen Veränderungen quer über den Kontakthof unter ähnlichen physikalischchemischen Bedingungen je nach dem lithologischen Aufbau unterschiedlich ist. Solch eine Vielfältigkeit in der thermalen Auswirkung der Kontaktgesteine wird verursacht durch den Unterschied in der chemischen Zusammensetzung, den geologischen Aufbau, Makro- und Mikrostruktur der veränderten Gesteine, Art des Kontaktes, vorherrschenden Dampfdruck und Temperatur im System und schließlich durch den ursprünglichen SiO2-Gehalt des Gesteins. Der Mechanismus, der die Migration der Kationen auslöste, war hauptsächlich ein zweiseitiger Diffusionsprozeß, und der Ablauf der Kationenbewegung war während des gesamten Verlaufs der Metamorphose ständigen Veränderungen unterworfen.

Résumé

Les méta-sédiments archaiques, représentés par des roches pélitiques, sémipélitiques, calcaires et psammitiques aux environs de Richughuta, ont subi un métamorphisme thermal autor d'un pluton de granite-granodiorite. Un compte-rendu d'études chimiques et minéralogiques des représentants affectés et non-affectés des diverses unités de roches a été établi. Il montre que la tendance des changements chimiques à travers le contact varie selon le milieu lithologique sous des conditions physico-chimiques similaires. Une telle diversité de l'effet thermal des roches de l'auréole est causée par la différence du potentiel chimique, l'ambiance géologique, la macro- et micro-structure des roches affectées, la nature du contact, la pression-vapeur et la température dominant dans le système, et finalement par le contenu original de silice dans la roche. Le mécanisme contrôlant la migration des cations était principalement un procès de double diffusion et l'histoire du mouvement des cations change pendant toute la période de métamorphisme.

Краткое содержание

В районе Richughuta архейские м етаседименты предст авлены самыми различными породами, подвергнувшимися ме таморфизму. Влияние метаморфизм а на распределение раз личных элементов в эт их породах былоподверждено химическими и минера логическими методам и исследования. Влияние термическог о метаморфизма сказы вается не только на распределе нии химических элементо в, но и на ?????- и макрострук туре пород. По мнению автора, при рас пределении химическ их элементов в вышеназв анных породах ведущую роль играют процессы дифф узии.

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Copyright information

© Ferdinand Enke Verlag Stuttgart 1969

Authors and Affiliations

  • N. C. Ghose
    • 1
    • 2
  1. 1.Department of GeologyPatna UniversityPatna-5India
  2. 2.Patna-4India

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