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Pb Isotopic Geochemistry of the Nuri Cu‐W‐Mo Deposit and Its Implications in Shannan Area, Southern Tibet
Author(s) -
ZHU Feilin,
SHI Zeming,
NI Shijun,
HE Mingyou,
LI Juchu,
ZHANG Junji,
SONG Xuebing
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 - 10.1111/1755-6724.12374_81
Subject(s) - china , chinese academy of sciences , geochemistry , geography , geology , earth science , archaeology
In the ore district, the main strata are the Cretaceous and the upper Cretaceous-Paleogene. The ore bodies are mainly hosted in the Cretaceous Bima Group four (K1b4). The lithology of K1b4 includes argillaceous limestone, metamorphosed siltstone, andesitic tuff, marble, skarn and so on. In the mining area, faults are well developed, including NWW striking (F1), NW striking (F2), NNW striking (F3) and NE striking (F4). The ore-controlling structure is the NE striking (F4), which controls the spatial distribution of the skarn and associated ore body. The NWW fault (F1), NW fault (F2) and NNW fault (F3) formed earlier (Chen et al., 2011). The wall rock suffered extensive alteration, mainly as potassic, hornfels carbonicacidation, propylitic and skarn alteration. From Late Cretaceous to lower Oligocene, the magmatism was intensive, forming granodiorite, quartz diorite, granite-porphyry and adamellite. Influenced by the denudational faults, the ore bodies were generally thickbedded and massive, which are developed together with and are distributed along the layered skarn.