LA-ICPMS Zircon U-Pb Age of the Zhongchaye Vermiculite Deposit in Laiwu, Shandong Province

• 作者: LI Jie LI Shiyong SONG Mingchun SU Xuliang
• 来源期刊: 地质学报（英文版）
• 年，卷（期）: 2020,（5）
• 所属期刊栏目: RESEARCH ADVANCES
• 页码范围: 1721-1723
• 页数: 3页
• 语种: 英文

摘要

Objective The Zhongchaye vermiculite deposit is located north of Laiwu.Tectonically, it belongs to the Luxi Block, west of the Tan-Lu fault zone (Fig.1a).The crystalline basement of this area consists of the Neoarchean Taishan Group and Paleoproterozoic Granitoid.The overlying strata are mainly Paleozoic carbonate rocks, Mesozoic clastic rocks, and Cenozoic sediments (Fig.1b).The faults in the Luxi region are dominantly NWW-NW trending and are superimposed by multistage faults.The Zhongchaye vermiculite deposit exists within a thin layer of limestone and marlite in the Cambrian Mantou Formation.The ore bodies are found in weathered mica rocks.Vermiculite content is about 40-70 ％, with a maximum of 95 ％.The main ore body is ～2 m thick, 500-1000 m long, and is usually clustered in veins.The diagenetic age of an ultrabasic rock-alkaline rock assemblage, such as a carbonatite dyke and neighboring mica rock, has not been accurately determined in these areas.Determining this age has implications for the study of its genetic significance.