青藏高原冈底斯西段锆石Hf同位素及Sr-Nd同位素实验数据

数据为青藏高原冈底斯西段锆石Hf同位素及Sr-Nd同位素实验数据。锆石Hf同位素测试工作在中国地质科学院国家测试中心，在老师的帮助下完成。选择测试的位置尽量保证原位，测试束斑选取标准为20×40 μm，在原有参与测年的锆石颗粒上，选取的区域最多与原位置重合1/2，避开裂隙、包裹体等，选取15-18个点备用。分析点每达到10个样品测点，随即分析一次锆石标准GJ-1作为监控，根据实验室标准，本次实验GJ-1的测试精准度为0.28245~0.28249（2σ）。Sr-Nd同位素测试工作在中国科学技术大学MC-ICP-MS实验室进行。先使用高温熔样胆盛取大约100 mg粉末，加入数滴高纯度HClO4摇匀，再加入2~3 mL纯化HF，在190°C的温度下密闭加热7天；之后用阴离子交换树脂分离纯化铅元素，阳离子交换树脂将Rb、Sr和稀土元素分离。使用含有HDEHP萃取剂和2-乙基己基-正磷酸的聚四氟乙烯粉末分离纯化Nd和Sm元素。能够联合判断岩石的岩浆源区，进而判断岩石成因，对研究岩石学以及与其相关的矿床成因具有重要意义。

The dataset comprises experimental data of zircon Hf isotopes and Sr-Nd isotopes from the western segment of the Gangdese Belt, Tibetan Plateau.
The zircon Hf isotope analyses were completed at the National Research Center of the Chinese Academy of Geological Sciences with the assistance of instructors.
The analytical locations were selected to ensure in-situ measurement as much as possible. The analytical beam spot size was standardized to 20×40 μm. For the zircon grains previously used for dating, the selected analytical areas were allowed to overlap with the original locations by no more than 1/2, while cracks, inclusions and other undesirable features were avoided. A total of 15 to 18 candidate analytical spots were selected for backup use.
After every 10 analytical spots of samples, the zircon standard GJ-1 was analyzed as a quality control monitor. According to the laboratory's standards, the measurement precision of GJ-1 in this experiment was 0.28245–0.28249 (2σ).
The Sr-Nd isotope analyses were conducted at the MC-ICP-MS laboratory of the University of Science and Technology of China.
First, approximately 100 mg of sample powder was weighed into a high-temperature digestion vessel, to which several drops of high-purity perchloric acid (HClO4) were added and mixed thoroughly. Then, 2–3 mL of purified hydrofluoric acid (HF) was added, and the mixture was subjected to sealed heating at 190°C for 7 days.
Subsequently, lead was separated and purified using anion exchange resin, while Rb, Sr and rare earth elements (REEs) were separated using cation exchange resin.
Nd and Sm elements were separated and purified using polytetrafluoroethylene (PTFE) powder impregnated with HDEHP extractant and 2-ethylhexyl-normal phosphoric acid.
This dataset can be used to jointly constrain the magma source regions of rocks and further determine their petrogenesis, which is of great significance for the study of petrology and the associated ore-forming processes.

搜集汇总

背景与挑战

背景概述

该数据集包含青藏高原冈底斯西段锆石Hf同位素及Sr-Nd同位素的实验数据，用于研究岩石的岩浆源区和成因。数据通过严格的实验流程获得，包括锆石Hf同位素测试和Sr-Nd同位素测试，对岩石学及矿床成因研究具有重要意义。