Early Carboniferous Volcano-Magmatism and Related Mineralization in Yishijilike Mountain, Western Tianshan
LI Yong-jun
HU Ke-lian
ZHOU Ji-bing
TONG Li-li
TONG Li-ming
Abstract：The volcanic rock assemblage of Dahalajunshan Formation is island arc calc-alkaline sodic volcanic rocks formed at plate convergent margins. The distribution of the volcanic rocks coincides with the anomaly of Au-Ct~ All the gold-copper ore spots and mineralization spots in this area are volcanic rock-hosted of Dahalajunshan volcanic rocks, which show favorable oreforming condition of gold-copper deposits. The gold mineralization is hosted in volcanic rocks mostly, and the epithermal gold deposit is the most significant type in this region. The Kulesayi porphyry is calc-alkaline hypabyssal rock, whose average SiO_2 is 57. 06%-70. 74%, and they are rich in Al_2O_3, Na_2O, Sr and LREE, poor in MgO, Y, Yb and very poor in HREE. With their Na_2O/K_2O of more than 1, Sr/Y of 57. 67, and positive anomaly of Eu, they have characters of O-type adakite. The Kulesayi porphyry coincides with anomaly of Mo. Molybedenun deposit with good prospects for further exploration has been found here. The Kulesayi porphyry and Dahalajunshan volcanic rocks compose the assemblage of island arc volcanic rocks in Early Carboniferous, which enriches the tectonic rock association in this region, and is important for the geotectonic evolution study, regional metallogenic law exploration, and prospecting for the gold-copper deposit (relative to island arc volcanic rocks)and copper-molybedenun deposit (relative to adakite).
Keywords：Early Carboniferouscalc-alkaline island arc volcanic rockadakitegold-copper-molybedenun mineralizationYishijilike Mountainwestern Tianshan.
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 235-244 )