郯庐断裂带山东段金伯利岩和碱性岩浆岩的深源特征矿物信息及其资源能源意义
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本文为中国地质科学院基本科研业务费项目(编号 JYYWF20180101)资助成果。


Deep source characteristics of the kimberlite and alkaline intrusives in the Shandong segment of the Tan- Lu fault belt and their resource and energy significance
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    摘要:

    郯庐断裂带是太平洋西岸的中国东部乃至东北亚最重要的一条深断裂带,影响着中国东部的岩浆活动和有关固体矿产(金多金属、金刚石等)和能源(油气)的产出。该断裂的山东段被称为沂沭断裂带,其东侧的胶东金矿带是中国最重要的金矿床集中区,西侧则分布有金刚石(蒙阴金伯利岩群)、石油(胜利油田)等资源- 能源,其研究的理论意义和经济意义重大。借助于场发射扫描电镜支持下的自动矿物识别表征系统(AMICS),笔者从郯庐断裂带西侧的深部岩浆岩(金伯利岩和碳酸岩- 碱性杂岩)矿物组合中,识别出具有标志性的矿物组合,主要包括:① 金伯利岩的典型矿物组合为镁铝榴石- 钙铁榴石- 钙钛矿- 金云母- 磁铁矿- 铬铁矿±斜硅镁石±自然硅±金刚石等,并首次观察到自然硅,蚀变矿物组合——金云母- 富钛磁铁矿- 钛铁矿- 富钛尖晶石- 绿泥石等,这种矿物组合充分反映了较为还原的深部流体条件;② 碱性杂岩的典型矿物组合——方解石- 氟碳铈矿- 氟碳钙铈矿,叠加改造矿物组合——重晶石- 天青石- 白云石等。在碱性杂岩中,还观察到黄铁矿中含有异常高的深源的稀贵金属元素(Au、Co、Pt、Ru、Os、Ir、 Re等)。郯庐断裂带山东段(沂沭断裂带)岩浆岩中深部来源的矿物组合特征,为矿床成因研究和深部资源探测提供了重要信息。

    Abstract:

    The Tan- Lu Fault Belt (TLFB) on the west coast of the Pacific Ocean is the most important deep fault zone in east China and even northeast Asia. Due to its control on the magmatic activities in eastern China, and the main solid mineral (eg, gold polymetallic, diamond, etc) and energy (oil and gas, uranium, coal, etc) resources, the southern segment of the fault is also called the Yi- Shu fault belt. On the eastern side of the fault zone the most important gold ore belt in China, the Jiaodong gold ore belt is situated. On the western side, the Mengyin kimberlite clusters hosting the diamond ore and the oil fields such as the Shengli oilfield are located. Thus, research on the TLFB is of great theoretical and economic importance. By using Automatic Mineral Identification & Characterization System (AMICS) with support from the field emission scanning electron microscopy, the authors have identified typical mineral assemblages in rocks from deep- source magmatic activities, such as kimberlite belts, carbonatites- alkali complexes. The main results are: (1) the typical mineral assemblage of the kimberlite is pyrope + andradite+perovskite+phlogopite+chromite+chromium- rich magnetite±chlinohumite±native silicon±diamond etc., and its alteration mineral combination: phlogopite+titanium- rich magnetite + ilmenite + titanium- rich spinel, etc., and for the first time native silicon is observed. This kind of mineral paragenesis fully reflects the strong reduced deep fluid conditions; (2) the typical mineral combination of carbonate- alkaline complexes is calcite+bastnaesite+parisite, and its alteration mineral combination: barite+celestine+dolomite, etc. In carbonatites and alkaline complexes rare metal (Au, Co, Pt, Ru, Os, Ir, Re, etc.) mineralization is also observed. The concentration of these metals can reach tens of thousands of times of abundance of the earth’s crust in east China. No negative geochemical anomalies of the metals occur in areas surrounding the mineralized zone indicating that this kind of element enrichment was sourced from deep geological fluid. The magma characteristics of deep source in the southern part of the Tan- Lu fault belt (Yi- Shu fault belt) and the mineral assemblages provide new guidelines in mineralogical research for future deep exploration and studies.

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曾普胜,赵九江,温利刚,汪双清,张小涛,王十安.2020.郯庐断裂带山东段金伯利岩和碱性岩浆岩的深源特征矿物信息及其资源能源意义[J].地质学报,94(9):2626-2639.
ZENG Pusheng, ZHAO Jiujiang, WEN Ligang, WANG Shuangqing, ZHANG Xiaotao, WANG Shi’an.2020. Deep source characteristics of the kimberlite and alkaline intrusives in the Shandong segment of the Tan- Lu fault belt and their resource and energy significance[J]. Acta Geologica Sinica,94(9):2626-2639.

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  • 收稿日期:2020-04-30
  • 最后修改日期:2020-06-14
  • 录用日期:2020-06-14
  • 在线发布日期: 2020-06-22
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