Korean Journal of Mineralogy and Petrology (광물과 암석)

The Petrological Society of Korea & The Mineralogical Society of Korea (한국암석학회 & 한국광물학회)
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Geology and Mineralization in Zacatecas State, Mexico

멕시코 자카테카스 주의 지질 및 광화작용

  • Heo, Chul-Ho (Mineral Resources Development Research Center, Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Oh, Il-Hwan (Mineral Resources Development Research Center, Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
  • 허철호 (한국지질자원연구원 광물자원연구본부 자원탐사개발연구센터) ;
  • 오일환 (한국지질자원연구원 광물자원연구본부 자원탐사개발연구센터)
  • Received : 2021.02.23
  • Accepted : 2021.03.10
  • Published : 2021.03.31
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Abstract

The exposed rocks in the Zacatecas state include mainly Mesozoic sedimentary and volcanic, Cenozoic volcanic and plutonic rocks. Paleozoic metamorphic rocks found in the northwestern portion of the state are considered as the most ancient rocks. These rocks correspond to the Caopas Formation which underlays the Later Paleozoic Rodeo Formation. The Mesozoic sequences are represented by a marine sedimentary sequence of the Later Triassic and the red beds of the Triassic-Jurassic Nazas Formation. The marine sediments of the Upper Jurassic overlay the Nazas Formation or metamorphic rocks from the Paleozoic. The Cretaceous sequences comprises marine sedimentary rocks in the north and northeast, and a volcanosedimentary set in the center and southeast. The Cenozoic is represented by volcanic nondifferentiated rocks, intrusive igneous rocks of acid and intermediate composition, and continental conglomerates with evaporitic sediments. The Quarternary sequences includes basalts, piedmont deposits, alluviums and occasionally, layers of evaporites and saltpeter. Furthermore, a great diversity of mineral deposits of both metallic and nonmetallic types occur in Zacatecas state. The rocks composing these deposits are extremely varied and include formations from Paleozoic to Tertiary. The mineralization age of ore deposits corresponds to the Tertiary in approximately 90%, and their genesis is mainly considered as epigenetic.

멕시코 자카테카스 주의 지질은 주로 중생대 퇴적암 및 화산암, 신생대 화산암 및 심성암으로 구성된다. 주 북서쪽의 고생대 변성암은 층서적으로 가장 오래된 암석이다. 이 암석은 층서적으로 카오파스층과 일치하며 이 층하부에는 후기 고생대 로데오층이 놓여있다. 중생대 층서는 후기 삼첩기의 해양성 퇴적층서와 삼첩기-쥐라기 나자스층의 적색층이 대표적이다. 상부 쥐라기 해양성 퇴적층은 나자스층 또는 고생대 변성암 상위에 놓여있다. 백악기층은 북쪽 및 북동쪽에 부존하는 해양성 퇴적암과 중앙 및 남동쪽의 화산성 퇴적암으로 구성된다. 신생대는 화산성 미분화 암석, 산성 및 중성의 조성을 지닌 관입성 화성암 및 증발성 퇴적물을 지닌 대륙성 역암으로 구성된다. 제4기는 현무암, 산록 퇴적물, 충적층, 증발암 및 염류피각을 포함한다. 다양한 유형의 금속 및 비금속광상이 자카테카스 주에 분포한다. 이들 광상을 구성하는 암석들은 다양하며 고생대부터 제3기까지 층들을 포함한다. 광상 생성시기는 90%가 제3기에 해당되며, 광상생성은 주로 후생기원이다.

Keywords

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