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PGE Geochemical Characteristics of Mandong Cu-Ni Sulfide Deposit in Baotan Area of the Northern Guangxi, China and Their Constraints on Deposit Genesis(PDF)

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

Issue:
2021年第04期
Page:
674-685
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
PGE Geochemical Characteristics of Mandong Cu-Ni Sulfide Deposit in Baotan Area of the Northern Guangxi, China and Their Constraints on Deposit Genesis
Author(s):
PENG Yong-xin1;  MA Shou-xian2*
(1. Guangdong Jinyan Industry Group Co., Ltd., Meizhou 514021, Guangdong, China; 2. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China)
Keywords:
deposit genesis;  Cu-Ni sulfide;  platinum group element;  sulfide segregation;  massive ore;  metallogenic model;  Neoproterozoic;  Guangxi
PACS:
P611
DOI:
10.19814/j.jese.2020.07030
Abstract:
The genetic relationship of massive and disseminated ores of Cu-Ni sulfide deposits in Baotan area of the northern Guangxi is highly debated, which is of great significance for acknowledgement of the genesis of Cu-Ni sulfide deposits and mineral exploration in the future. The characteristics of platinum group elements(PGE)of ores and barren rocks from Cu-Ni sulfide deposits were analyzed to constrain the genesis of Mandong Cu-Ni sulfide deposit in Baotan area. The results show that total contents of PGE of the disseminated and massive ores as well as barren rocks are quite low and well positively correlated with the content of sulfide, the PGE are significantly depleted relative to Cu and Ni; the primitive mantle-normalized PGE spider diagram of ores and barren rocks is weakly differentiated with variable Pt contents, and the ratios of Pd/Ir are 0.93-15.41; the massive ore shows a negative Pt pattern, while the disseminated ore has a bit positive Pt anomaly, and the barren rocks have no anomaly; the ratios of Cu/Pd of ores and barren rocks range from 10.38×103 to 1 830.00×103, much higher than that of primitive mantle(6 500), implying the occurrence of sulfide segregation in the deep of Mandong Cu-Ni sulfide deposit, which results in PGE depletion of the newly formed ores and barren rocks in the shallow intrusions; minerals rich in Pt directly crystallize from the sulfide melt prior to monosulfide solid solution(MSS)crystallization, and then the sulfide melts migrate away from the minerals rich in Pt along structural fractures and form the massive ores, which result in Pt depletion of the massive ores.

References:

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