| 不同地质建造类型的生态环境功能特征——以西昌地区为例 |
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| 作者姓名： | 张腾蛟 刘洪 欧阳渊 张景华 张振杰 李樋 |
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| 作者单位： | 1.中国地质调查局成都地质调查中心,四川 成都 610081;2.成都理工大学地球科学学院,四川 成都 610059;3.中国地质大学(北京)地球科学与资源学院,北京 100083 |
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| 基金项目： | 中国地质调查局”生态地质调查工程(编号: 0703)”“大凉山区生态地质调查(编号: DD20190542)”“西南地区自然资源综合调查(编号: DD20211386)”项目联合资助 |
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| 摘 要： | 地质建造背景可以直接反映该地区的形成演化过程、物质组成和地理条件,直接或间接地影响基岩上的生态环境。小范围内生态环境效应由地质建造直接控制,再由不同的气候条件、人类活动进行改造。土壤中的营养元素基本继承于母岩,而气候条件和人类活动同样会对土壤的物理性质、化学性质形成扰动。以中国地质调查局生态地质调查工程之大凉山区生态地质调查项目为依托,以沉积建造特征、空间分布、大地构造属性等因素为基础,将西昌地区划分为11个地质建造单元。通过详细的野外调查和数据分析,对西昌地区不同地质建造单元进行研究,认为建造单元上的生态地质环境存在明显的差异性,地质建造背景直接制约了成土母质及土壤的物理化学性质,营养元素在成土母质和土壤之间的迁移存在明显的继承性。同时,不同的地质建造单元和不同的地理地貌特征共同决定了不同地质建造单元的生态功能属性。研究成果为下一步开展生态地质调查提供依据和思路。
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| 关 键 词： | 生态地质调查 西昌地区 地质建造 生态环境 |
| 收稿时间： | 2021-09-06 |
Chemical composition of the chromite and diamond potentiality of Bailushan rock mass in Suining area of Xuzhou |
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| Authors: | ZHOU Qizhong ZHANG Qi FENG Xuezhi WANG Bo QIU Lei WANG Guoqiang |
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| Institution: | 1. Chengdu Center, China Geological Survey, Sichuan Chengdu 610081, China;2. College of Earth Sciences, Chengdu University of Technology, Sichuan Chengdu 610059, China;3. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China; |
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| Abstract: | Bailushan rock mass is an important diamond-bearing rock mass in Northern Jiangsu Province. On the basis of the chemical composition of the chromite in Bailushan rock mass, the authors discussed its genesis and significance of the diamond potentiality and analyzed the diamond mineralization potential of Bailushan rock mass. The chromite in Bailushan rock mass has characteristics of high Cr, low Al and high Mg, which belongs to the magnochromite. It was crystallized from the peridotite that originated from the deep mantle, not a crystalline product of the rock mass, which is most likely derived from a deep-source trap in the rock mass. The crystallization temperature is 1 253~1 354 ℃, which is consistent with the formation temperature of the diamond (1 150~1 400 ℃), indicating a close relationship between them. The chemical composition of the chromite from Bailushan rock mass is very similar to that from the ore-bearing kimberlites in Shandong and Liaoning. Most chromites belong to S4 and S6, and a few chromites belong to S1 and S2. S1 and S2 chromites are the marked minerals of diamond-bearing rock mass. Bailushan rock mass has good diamond potential and prospecting prospects. |
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| Keywords: | Bailushan rock mass chromite chemical compostion diamond potentiality |
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