Genesis of the Tianping flake graphite deposit at the western margin of Yangtze Block, SW China
Genesis of the Tianping flake graphite deposit at the western margin of Yangtze Block, SW China
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扬子地块西缘天平鳞片石墨矿床成因
DOI：
10.1016/j.oregeorev.2021.104434
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发表时间：
2021-12
影响因子：
3.3
通讯作者：
Liu Lin
中科院分区：
文献类型：
--
作者：
Ma Yuan;Huang Yang;Liu Lin
天平鳞片石墨矿床位于中国南扬子地块西缘。是康甸地轴石墨成矿带中最大、最具代表性的鳞片石墨矿床之一，储量达800万吨。石墨矿体赋存于石墨片岩和云母石英片岩中。石墨矿的碳同位素数据显示轻碳值在−26.3‰至−28.8‰之间，表明其为生物成因。根据石墨样品中碎屑锆石的U-Pb定年结果，天坪石墨矿床中碳质物质的沉积年龄约为833 Ma。拉曼光谱计算的石墨变质温度在414~436℃之间，表明绿片岩-角闪岩相变质作用是无序碳质向结晶良好的石墨转变的主要原因。在碳质物质沉积和区域变质作用形成石墨后，在区域深成侵入所带来的高温环境中，石墨可再结晶形成大片石墨片。在前人研究和新资料的基础上，提出了天平鳞片石墨矿床包括物质沉积过程、区域变质作用、晚期岩浆作用和接触变质作用的三阶段成因模式。
The Tianping flake graphite deposit is located in the western margin of the Yangtze Block, South China. It is one of the biggest and representative flake graphite deposits with 8 million tons of flake graphite in the Kangdian Axis graphite metallogenic belt. The graphite orebodies are hosted in graphite schist and mica quartz schist. Carbon isotope data for graphite ore show light carbon values between −26.3‰ to −28.8‰ which suggests a biogenic origin. The carbonaceous materials of the Tianping graphite deposit were deposited younger than ca. 833 Ma according to U-Pb dating results of detrital zircons in graphite samples. The calculated metamorphic temperature of graphite from Raman spectra is between 414 and 436 ± 50 °C, indicating a greenschist to amphibolite facies metamorphism is responsible for the transformation of disordered carbonaceous matter into well-crystallized graphite. After carbonaceous material deposition and graphite formation by regional metamorphism, the graphite may recrystallize and form large graphite flakes in a heated environment brought by the intrusion of plutons in the region. Based on previous studies and new data, a three-stage genesis model including processes of material deposition, regional metamorphism, later magmatism, and contact metamorphism for Tianping flake graphite deposit is proposed.
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