矿床地质2013，Vol.32Issue(1)：169-176,8.
青海它温查汉铁多金属矿床40Ar-39Ar年代学研究及意义
40Ar-39Ar geochronology of Tawenchahan Fe-polymetallic deposit in Qimantag Mountain of Qinghai Province and its geological implications
摘要
Abstract
Located in the basin overburden area between the Qaidam Basin and the Qimantag Mountain, the Tawenchahan deposit is a typical skarn Fe-polymetallic deposit characterized by heavy sand overburden and various mineralization elements. The detailed geological features and he ore-forming age of the Tawenchahan deposit were studied in this paper. In order to obtain the ore-forming age, the authors measured the muscovite separated from skarn magnetite ore in the Tawenchahan Fe-polymetallic deposit by the 40Ar-39Ar incremental heating method, and the results yield a 40Ar-39Ar plateau age of (230.7 ± 2.0) Ma and an isochron age of (229.9 ± 3.5) Ma with MSWD being 1.8. It is shown that the Tawenchahan Fe-polymetallic deposit was formed during Indosinian period. These new age data, combined with the available petrogenetic and metallogenic chronological data obtained by SHRIMP zircon U-Pb, zircon LA-ICP-MS U-Pb, molybdenite Re-Os isochron and Ar-Ar methods in Qiman- tag area of Qinghai Province, indicate that this deposit was formed from the collisional to post-collisional environment, and belonged to the metallogenic series of Fe-Cu-Pb-Zn-Au polymetallic deposits related to Indosinian collision orogeny in eastern Kunlun.关键词
地球化学/矽卡岩型矿床/40Ar-39Ar同位素年龄/印支期/它温查汉/青海/祁漫塔格/东昆仑Key words
geochemistry, skarn deposit, 40Ar-39Ar age, Indosinian, Tawenchahan, Qinghai Province, Qi- mantag area, East Kunlun分类
天文与地球科学引用本文复制引用
田承盛,丰成友,李军红,曹德智..青海它温查汉铁多金属矿床40Ar-39Ar年代学研究及意义[J].矿床地质,2013,32(1):169-176,8.基金项目
本文得到中国地质调查局地质调查项目(1212011085528,1212011120135)、中国地质调查局青年地质英才计划(201112)和国家自然科学基金项目(批准号:41172076)的联合资助 （1212011085528,1212011120135）
