武汉理工学院Yin, Jianzhao及其课题组成员，经过不懈努力揭示了青藏高原Dashuigou独立碲矿床的起源，并提供了来自轻稳定碳同位素碳、氧和氢的限制依据。2024年1月11日出版的《地球化学学报》杂志发表了这一最新研究成果。

研究区白云岩样品的δ¹⁸O和δ¹³C同位素特征分别在10.2到13.0‰之间和-7.2到-5.2‰之间变化，结果表明，碳来源于上地幔。不同矿脉中石英、黑云母和白云母的δD值和δ¹⁸O值分别在-82到-59‰和11.6到12.4‰之间变化，结果表明，成矿溶液以岩浆为主。

根据许多同位素地质学家的相关研究结果，氢同位素的分馏程度随着地核深度的增加而增加，氢同位素分异程度越高，其数值越低。换句话说，幔源溶液的氢同位素值极低。这意味着本文编号为SD-34的磁黄铁矿样品的δD‰值-134个可能指示该矿床的幔源成矿流体。Dashuigou碲矿床形成于91.71和80.19 Ma之间。

据介绍，研究结合碳、氧、氢的轻同位素组成和前人对该矿床成矿物质来源的成果，试图揭示该矿床的成矿起源。

附：英文原文

Title: Origin of the Dashuigou independent tellurium deposit at Qinghai–Xizang Plateau: constraints from the light stable isotopes C, O, and H

Author: Yin, Jianzhao, Chao, Yuhong, Yin, Haoyu, Shi, Hongyun, Xiang, Shoupu

Issue&Volume: 2024-01-11

Abstract: By studying the light isotopic compositions of carbon, oxygen, and hydrogen, combined with previous research results on the ore-forming source of the deposit, the authors try to uncover its metallogenic origin. The δ¹⁸O and δ¹³C isotope signatures of dolomite samples vary between 10.2 and 13.0‰, and between -7.2 and -5.2‰, respectively, implying that the carbon derives from the upper mantle. δD and δ¹⁸O of quartz, biotite, and muscovite from different ore veins of the deposit vary between -82 and -59‰, and between 11.6 and 12.4‰, respectively, implying that the metallogenic solutions are mainly magmatic. According to the relevant research results of many isotope geologists, the fractionation degree of hydrogen isotopes increases as the depth to the Earth’s core increases, and the more differentiated the hydrogen isotopes are, the lower their values will be. In other words, mantle-derived solutions can have extremely low hydrogen isotope values. This means that the δD‰ value-134 of the pyrrhotite sample numbered SD-34 in this article may indicate mantle-derived ore-forming fluid of the deposit. The formation of the Dashuigou tellurium deposit occurred between 91.71 and 80.19 Ma.

DOI: 10.1007/s11631-023-00665-z

Source: https://link.springer.com/article/10.1007/s11631-023-00665-z