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Geochemical Characteristics of Tanjianshan Gold Deposit in Qinghai Province
Author(s) -
CHEN Haiming,
ZHOU Zonggui,
GONG Yongjun,
DAI Liguo
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 - 10.1111/1755-6724.12384_2
Subject(s) - china , library science , chinese academy of sciences , geology , earth science , mining engineering , history , archaeology , computer science
Tanjianshan gold deposit is one of the major gold deposits discovered in Qinghai Province, situated at the eastern extremity of Shaishiteng Mountain in Dachaidan in Qinghai Province, in the western part of the northern margin of the Qaidam Basin. The main strata outcropped by the deposits are that Lower Proterozoic Dakendaban group, Mesoproterozoic Wandonggou group, Upper Ordovician Tanjianshan group, Upper Devonian Yak mountain group, Upper Triassic Ela mountain group and Quaternary sediments. Occurrence regularity of ore bodies exist in carbonaceous phyllite schist segment, most of which are altered phyllite or schist type. Ore minerals mainly contain arsenopyrite and pyrite, etc., the common structures of ore include cube-shaped or hypidiomorphic grain-like structure, rim and zonal structure, sieve-like structure, pentagonal dodecahedron euhedral or subhedral grain-like structure, ore structures mainly include: scattered disseminated structure, eye-shaped lumpy structure, veinlet-disseminated structure and dense disseminated structure. The wall-rock alteration of ore deposits are mainly pyritization, silicification and sericitization. The forming process of the primary ores of Tanjianshan gold deposit is divided into three phases: initial enrichment of sedimentary metamorphism, deformation and metamorphism and magmatic hydrothermal superimposition.