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Fluid Inclusion and Isotopic Characteristics of the Dongleiwan Skarn Deposit in Jiangxi Province
Author(s) -
JIA Liqiong,
XU Wenyi,
YANG Dan,
CHEN Weishi,
YANG Zhusen,
WANG Liang
Publication year - 2014
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12379_28
Subject(s) - metallogeny , beijing , china , chinese academy of sciences , skarn , geology , mineral resource classification , geochemistry , mining engineering , archaeology , geography , fluid inclusions , sphalerite , seismology , pyrite , hydrothermal circulation
The tectonic position of the Dongleiwan deposit is located in the northern margin of the Yangtze Block. The deposit belongs to the Jiujiang-Ruichang Cu-Au ore field and is one of the important parts of the Daye-Jiujiang metallogenic sub-belt of the middle-lower Yangtze River metallogenic belt. The exposed formations include the Permian Changxing Group (P2c), Triassic Daye Group (T1d), and Jialingjiang Group (T2j) as well as the Quaternary. The northern part of the deposit is the Miaomushan Anticline while the center is the Dongleiwan Syncline. There are seven relatively large fracture belts within the area in which mineralization is very common. The Dongleiwan intrusion is a composite one related to the mineralization, with the granodiorite in the center, quartz-diorite-porphyry in the margin and coarse-grained granodiorite-porphyry in the middle. The deposit could be divided into two ore belts. The north ore belt is located in the north limb of the syncline with widely distributed chalcopyrite and pyrite mineralization. The south ore belt is located in the south limb of the syncline. Disseminated pyrite and malachite can be observed locally. The structures of the ores include massive and disseminated structures while the ore textures are mainly hypidiomorphic-granular texture and metasomatic relict texture. The main metal minerals of ores are chalcopyrite, pyrite, bornite, molybdenite, scheelite as well as minor sphalerite and bismuthinite while gangue minerals include garnet, quartz, chlorite, diopside, calcite, and fluorite. Wall rock alterations consist of skarnization, chloritization, epidotization and carbonatation. The skarnization is the most common one and also closely related with mineralization. The oreforming process can be divided into four stages: (1) skarnization stage in which garnet, diopside and other anhydrous silicates were formed; (2) retrograde alteration stage in which phlogopite, epidote, chlorite and tremolite and magnetite were formed; (3) quartz sulfide stage which is the most important stage for mineralization of copper and molybdenum within this deposit; and (4) carbonate stage in which the main composition is calcite, pyrite and chlorite.