Volume 25 Issue S1
May  2019
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Article Navigation >  Journal of Geomechanics  > 2019  >  25(S1): 129-134
QIU Ruizhao, CHEN Yuming, CHEN Xiufa, et al., 2019. DISCUSSION ON THE TWO TYPES OF PORPHYRY COPPER MINERALIZATION IN NORTHERN CHILE AND NORTHWEST ARGENTINA. Journal of Geomechanics, 25 (S1): 129-134. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.022
Citation: QIU Ruizhao, CHEN Yuming, CHEN Xiufa, et al., 2019. DISCUSSION ON THE TWO TYPES OF PORPHYRY COPPER MINERALIZATION IN NORTHERN CHILE AND NORTHWEST ARGENTINA. Journal of Geomechanics, 25 (S1): 129-134. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.022
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DISCUSSION ON THE TWO TYPES OF PORPHYRY COPPER MINERALIZATION IN NORTHERN CHILE AND NORTHWEST ARGENTINA

doi: 10.12090/j.issn.1006-6616.2019.25.S1.022
  • 1.

    China Geological Survey, Development and Research Center, Beijing 100037, China

  • 2.

    China University of Geosciences (Beijing), Beijing 100083, China

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  • Published: 2019-05-01
    Abstract
  • The Mesozoic-Cenozoic porphyry copper deposits in northern Chile and northwestern Argentina were formed in the orogenic setting of the Paleozoic terrane collocation. With the opening of the Atlantic Ocean, the South American continent drifted westward, in Mesozoic-Cenozoic the South American craton was subducted beneath the Paleozoic orogenic belts to form a thicker or double crust. As a part of the active continental margin of South America, northern Chile continuously "swallowed" the Pacific (Nasca) plate which subducted eastward. The mineralization of porphyry copper deposits in northern Chile occurred after the large-scale magmatic activity which caused by slab-failure subduction of the Pacific (Nazca) plate, and repeatedly took place along the reactivated lithosphere discontinuities (the pre-existing Paleozoic splice zones and regional faults), forming so-called Andean-type porphyry copper deposits; The large-scale copper (gold, molybdenum) mineralization in northwestern Argentina was associated with the collapse of the thickened orogenic belt. The large-scale mineralization was controlled by the large-scale magmatism caused by the de-rooting of the orogenic lithosphere, asthenospheric material and thermal upwelling. Overall, Porphyry copper deposits of the Andean-type and orogenic collapse-type in northern Chile and northwestern Argentina, as well as the formation of the Andean copper (gold) metallogenic belt in South America, are closely related to the westward drift of the South American continent and the opening of the Atlantic Ocean since the Mesozoic and Cenozoic.

     

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