|Table of Contents|

Discovery of High-Mg Diorites in Nabire Area, Indonesia and Its Implications(PDF)

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

Issue:
2022年第03期
Page:
499-512
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Discovery of High-Mg Diorites in Nabire Area, Indonesia and Its Implications
Author(s):
ZHANG Bo1; 2;  XU Ying-hao2;  WANG Guo-dong3; 4;  CUI Xiao-liang5;  LI Zeng-sheng6; 7;  SU Shang-guo2*;  CHEN Xue-gen2
(1. Development and Research Center, China Geological Survey, Beijing 100037, China; 2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China; 3. School of Resources and Environment, Linyi University, Linyi 276005, Shandong, China; 4. Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, Linyi University, Linyi 276005, Shandong, China; 5. School of Water Conservancy and Hydroelectric Power, Hebei University of Engineering, Handan 056038, Hebei, China; 6. Shandong Provincial Key Laboratory of Metallogenic Geological Processes and Resource Utilization, Shandong Institute of Geological Sciences, Jinan 250013, Shandong, China; 7. Key Laboratory of Gold Mineralization Processes and Resource Utilization of Ministry of Natural Resources, Jinan 250013, Shandong, China)
Keywords:
high-Mg diorite;  geochemistry;  petrogenesis;  Cu-Au deposit;  tectonic setting;  plate subduction;  Central Orogenic Belt of New Guinea
PACS:
P57; P59; P581
DOI:
10.19814/j.jese.2022.04042
Abstract:
The Central Orogenic Belt of New Guinea is the youngest orogenic belt, and is also the most important porphyry-type Cu-Au metallogenic belt around the world. A set of high-Mg diorites have been found in Nabire area, Indonesia, which is located in the central-northwestern part of Central Orogenic Belt of New Guinea. They provide favorable records for the detailed study of the magmatic process and metallogenic environment related to ocean subduction. As revealed by field observations and the study of petrological and geochemical characteristics, these diorites mainly include fine-grained amphiboles and plagioclases, with no visible olivine xenoliths or xenocrysts. These rocks have high contents of MgO(4.51%-10.88%), Yb((1.16-2.69)×10-6), and Y((11.68-25.09)×10-6), and high Mg#(50.07-72.50). Moreover, they are enriched in LILEs and depleted in HFSEs, and have low Sr/Y and La/Yb ratios. Combined with relatively consistent Nb/La, U/Nb, Th/La, and U/Th ratios, the high-Mg diorites may have evolved from the interactions between subduction sediment melt and overlying mantle peridotite, as well as fractional crystallization. This evolution was accompanied by the release of large amounts of H2O and fluids, leading to the increase of oxygen fugacity. Relevant studies show that high-Mg andesites/diorites have a similar formation environment to that of porphyry-type Cu-Au deposits and a close affinity with porphyry-type Cu-Au deposits, and thus serve as a prospecting indicator of large porphyry deposits. The Cu-Au mineralization has occurred in high-Mg diorites of Nabire area, indicating that this area has the potential for the prospecting of large Cu-Au deposits.

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Last Update: 2022-06-01