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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:

2021年第03期

Page:

506-527

Research Field:

基础地质与矿产地质

Publishing date:

Info

Title:

Comparison Between Erdenet Porphyry Cu-Mo and Oyu Tolgoi Porphyry Cu-Au Deposits in the Central Asian Metallogenic Domain

Author(s):

LI Run-wu¹; 2;  TONG Ying^2*;  SU Shang-guo¹

(1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China; 2. Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China)

Keywords:

metallogenic regularity;  porphyry deposit;  mineralizing porphyry;  geological characteristic;  geochemistry;  petrogenesis;  tectonic setting;  Central Asian metallogenic domain

PACS:

P612

DOI:

10.19814/j.jese.2021.03027

Abstract:

The Central Asian metallogenic domain(CAMD)is located between the Siberian craton to the north, the North China-Tarim craton to the south, and the East Europe craton to the west. It's considered as one of the three major metallogenic domains in the world along with the Circum-Pacific and the Tethyan metallogenic domains. There exists a series of porphyry Cu-Au, Cu(Au, Mo)and Cu-Mo deposits, and the two representative deposits from them, namely Erdenet porphyry Cu-Mo and Oyu Tolgoi porphyry Cu-Au deposit, were chosen to make comprehensive comparisons in terms of geological characteristics and ore-related rocks geochemical features. Mineralizing porphyrys of Erdenet porphyry Cu-Mo deposit are mainly granites and granodiorites, and the volcanic rocks developing in the same period are primarily andesite, dacite and rhyolite, all of which show calc-alkaline to high-K calc-alkaline series rocks. Mineralizing porphyrys of Oyu Tolgoi porphyry Cu-Au deposit are mainly quartz monzodiorites, and the same period's volcanic rocks primarily consist of dacite-basaltic rocks, belonging to high K calc-alkaline series. The trace and rare earth elements of the ore-related rocks from the above two deposits show typical features of arc magmatic rocks. However, compared with Oyu Tolgoi porphyry Cu-Au deposit, Erdenet porphyry Cu-Mo deposit shows high Sr/Y and La/Yb ratios, low contents of compatible elements(Cr, Ni)and relatively enriched Sr-Nd-Hf isotopic compositions. Combined with the regional geological background of the study area, it is believed that the mineralizing porphyrys of Erdenet porphyry Cu-Mo deposit originate from the partial melting of the thickened young lower crustal material, and are formed in a continental arc tectonic setting during the end of the Mongol-Okhotsk ocean evolution, while Oyu Tolgoi porphyry Cu-Au deposit's mineralizing porphyrys generate from fractional crystallization of depleted mantle materials, and form in an island arc tectonic setting. Therefore, it can be concluded that Erdenet porphyry Cu-Mo and Oyu Tolgoi porphyry Cu-Au deposits develop different mineral resources, matching themselves' tectonic setting where they formed. The above conclusions may help us better understand the relationship between the metallogenic tectonic environment and the types of porphyry deposits in the CAMD, and then have significant influence for the exploration of porphyry mineral resources under different tectonic environments.

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