| 北大巴山平利县大坪—金岭重晶石矿床地球化学特征与成矿物源分析 |
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| 引用本文： | 曹林杰,张运周,李四龙,王志红,张瑶,张寒.北大巴山平利县大坪—金岭重晶石矿床地球化学特征与成矿物源分析[J].现代地质,2022,36(6):1497-1502. |
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| 作者姓名： | 曹林杰 张运周 李四龙 王志红 张瑶 张寒 |
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| 作者单位： | 1.陕西地矿第一地质队有限公司,陕西 安康 7250002.中国石化西南油气分公司 石油工程技术研究院,四川 德阳 618000 |
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| 基金项目： | 陕西省地勘基金项目“陕西省紫阳双安一带硒资源远景调查”(61201707326) |
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| 摘 要： | 大坪—金岭重晶石矿床位于南秦岭平利复背斜南翼,处于大巴山平利穹隆南西缘。通过区域地质构造背景、矿床地质特征、碳氧同位素与稀土元素分析,初步探讨了大坪—金岭重晶石矿床的成矿物质来源和矿床成因。通过地球化学分析结果可知,样品δ18OV-SMOW介于1.44‰~2.20‰,测得温度介于60.72~122.87 ℃。矿石与围岩具相似的稀土元素特征,具高LREE/HREE值,δEu负异常,δCe也为负异常,说明重晶石与围岩物质的来源可能相同。结合矿床地质特征研究,认为大坪—金岭重晶石矿床赋矿层位为寒武系鲁家坪组,矿床形成于大陆边缘斜坡,该沉积环境为$SO_{4}^{2-}$形成提供优越的条件,震旦系灯影组地层可能为大坪—金岭重晶石矿床Ba的主要来源,矿床为受断层破碎带控制的低温热液矿床。
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| 关 键 词： | 鲁家坪组 地球化学 成矿物质来源 北大巴山 |
| 收稿时间： | 2021-09-19 |
| 修稿时间： | 2022-07-07 |
Geochemical Characteristic and Ore-forming Material Sources of Daping-Jinling Barite Deposit in Northern of Daba Mountain |
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| CAO Linjie,ZHANG Yunzhou,LI Silong,WANG Zhihong,ZHANG Yao,ZHANG Han.Geochemical Characteristic and Ore-forming Material Sources of Daping-Jinling Barite Deposit in Northern of Daba Mountain[J].Geoscience——Journal of Graduate School,China University of Geosciences,2022,36(6):1497-1502. |
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| Authors: | CAO Linjie ZHANG Yunzhou LI Silong WANG Zhihong ZHANG Yao ZHANG Han |
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| Institution: | 1. Shaanxi Geology and Mining First Geological Team Co. Ltd, Ankang, Shaanxi 725000, China2. Petroleum Engineering Technology Research Institute, SINOPEC Southwest Oil and Gas Branch Company,Deyang, Sichuan 618000, China |
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| Abstract: | The Daping-Jinling barite deposit is located in southern wing of the Qinling compound anticline in the southern Qinling Mountain, on the southern and western edge of the Pingli dome of Daba Mountain. The geochemical characteristic and ore-forming material sources of Daping-Jinling barite deposit in northern Daba Mountain were studied on geological background, deposit geological characteristics, carbon and oxygen isotopic and rare earth elements. The oxygen isotope compositions showed that the δ18OV-SMOW ranged from 1.44‰ to 2.20‰, indicating that the ore-forming temperature was low-or-medium temperature(60.72-122.87 ℃). The ore and surrounding rock had similar rare earth element characteristics to reveal that the material sources of barite and surrounding rock may be the same, with high ratio of HREE/LREE, anomaly negative europium, anomaly negative cerium. The analysis of petrogenesis and tectonic environment indicates that the horizon of barite deposit is hosted the Cambrian Liujiaping Formation. The sedimentary environment is the slope facies of continental margin and provides superior conditions for the formation of $SO_{4}^{2-}$. The Sinian Dengying Formation in the underlying strata contained high abundance of Ba, which may be the main source of barium in the barite deposit. |
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| Keywords: | Lujiaping Formation geochemistry ore-forming material sources northern of Daba Mountain |
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