东昆仑雪山峰地区阿勒坦火山岩地球化学、年代学特征及构造环境分析

Geochemistry, Chronological Characteristics and Tectonic Setting of the Altan Volcanic Rocks in the Xueshanfeng Area, East Kunlun

通过1:5万区域地质矿产调查,在青海格尔木市雪山峰地区新发现一套新元古代的火山岩,主要岩性为一套未变质的沉凝灰岩,进行了岩石地球化学特征和锆石U-Pb年龄研究。用LA-ICP-MS测得锆石年龄为958.4±5.3Ma,时代为新元古代。在区域上该套火山岩显示为次深海相喷发沉积的产物,沉凝灰岩的构造环境为洋壳俯冲火山弧环境。通过该发现及研究以期望能为研究东昆仑造山带构造演化提供新的证据。

A new Proterozoic volcanic rock was newly discovered in the Xueshanfeng area of Golmud City, Qinghai Province through a 1:50,000 regional geological mineral survey. The main lithology is a set of undeformed tuff.Zircon U-Pb age and geochemical studies were performed after sampling. The age of zircon was 958.4±5.3Ma measured by LA-ICP-MS,so age is Neoproterozoic. Regionally, this suite of volcanic rocks is the product of sub-deep-sea facies eruption deposits, and the tectonic setting of sedimentary tuff is oceanic crust subduction volcanic arc environment. The findings and research are expected to provide new evidence for the study of the structure evolution of the East Kunlun orogenic belt.