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物探与化探  2021, Vol. 45 Issue (3): 645-652    DOI: 10.11720/wtyht.2021.1163
  地质调查 本期目录 | 过刊浏览 | 高级检索 |
略阳白雀寺杂岩体以西隐伏深大断裂的推断依据及其意义
游军1(), 张小明1, 罗乾周1, 史朝洋1, 杨运军1, 陈剑祥2, 袁攀2
1.陕西省矿产地质调查中心,陕西 西安 710068
2.陕西地矿汉中地质大队有限公司,陕西 汉中 723000
The inferential basis and significance of the deep fault to the west of the Baiquesi complex in Lueyan
YOU Jun1(), ZHANG Xiao-Ming1, LOU Qian-Zhou1, SHI Zhao-Yang1, YANG Yun-Jun1, CHEN Jian-Xiang2, YUAN Pan2
1. Shaanxi Center of Mineral Geological Survey, Xi’an 710068, China
2. Hanzhong Geological Party Co., Ltd., Shaanxi Bureau of Geology and Mineral Exploration, Hanzhong 723000, China
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摘要 

勉略宁地区是扬子板块周缘地质构造最为复杂的地区之一。通过对勉略宁西部白雀寺基性杂岩体以西的高磁异常带与区域重力异常梯度带及Fe、V、Ti等元素化探异常的对比研究,结合沿异常带分布的溢流相玄武岩的岩石地球化学特征,推测地表遥感解译出的NNE向浅层断裂深部可能存在规模更大的隐伏断裂。这一隐伏深大断裂可能为新元古代勉略宁地区弧后裂解背景下的幔源岩浆活动提供了重要通道:一方面由深成岩浆侵入形成白雀寺基性杂岩体与火成碳酸岩;另一方面,由裂隙式火山喷发形成带状展布的富含磁铁矿的溢流相玄武岩。这一隐伏深大断裂的推断对于勉略宁地区新元古代的地质构造背景与幔源岩浆成矿作用研究具有重要意义。

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游军
张小明
罗乾周
史朝洋
杨运军
陈剑祥
袁攀
关键词 重力地面高精度磁测岩石地球化学隐伏深大断裂白雀寺杂岩体    
Abstract

Mianluening area is one of the most complex areas of geological structure around the Yangtze plate. Based on the comparative study of the high magnetic anomaly zone to the west of Baiquesi basic complex, the regional gravity anomaly gradient zone and the geochemical anomalies of Fe, V, Ti and other elements, combined with the geochemical characteristics of the overflow phase basalts distributed along the anomaly zone, it is inferred that there may be a larger hidden fault in the deep part of the NNE-trending shallow faults interpreted by surface remote sensing. This hidden deep fault may have provide an important channel for the mantle-derived magmatic activity in the context of post arc cracking in Mianluening area in the Neoproterozoic. On the one hand, the Baiquesi basic complex and igneous carbonatite were formed by the intrusion of the plutonic magma; on the other hand, the belt like overflow phase basalt rich in magnetite was formed by the fissure type volcanic eruption. This finding is of great significance for the study of Neoproterozoic tectonic setting and mantle-derived magmatic mineralization in Mianluening area.

Key wordsgravity    ground high precision magnetic survey    petrogeochemistry    hidden deep fault    Baiquesi complex
收稿日期: 2020-04-09      出版日期: 2021-07-27
:  P631  
基金资助:陕西省地质勘查基金项目(61202009347);陕西省公益性地质调查项目(202105);陕西省公益性地质调查项目(20180304)
作者简介: 游军(1985-),男,博士,高级工程师,从事矿床学与地球化学研究工作。Email: 351851028@qq.com
引用本文:   
游军, 张小明, 罗乾周, 史朝洋, 杨运军, 陈剑祥, 袁攀. 略阳白雀寺杂岩体以西隐伏深大断裂的推断依据及其意义[J]. 物探与化探, 2021, 45(3): 645-652.
YOU Jun, ZHANG Xiao-Ming, LOU Qian-Zhou, SHI Zhao-Yang, YANG Yun-Jun, CHEN Jian-Xiang, YUAN Pan. The inferential basis and significance of the deep fault to the west of the Baiquesi complex in Lueyan. Geophysical and Geochemical Exploration, 2021, 45(3): 645-652.
链接本文:  
https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2021.1163      或      https://www.wutanyuhuatan.com/CN/Y2021/V45/I3/645
Fig.1  碧口地体东段(b)与勉略宁西部地质构造略图(a)(据文献[11,12]修改)
Fig.2  推测深大断裂展布区域富含磁铁矿变玄武岩(a)与侵位变玄武岩中火成碳酸岩透镜体(b)
分析项目 样品编号 分析项目 样品编号
S1028-5 S1028-6 S1028-7 L1028-1 L1028-3 S1028-5 S1028-6 S1028-7 L1028-1 L1028-3
SiO2 47.43 47.22 52.05 45.86 45.72 Th 0.76 0.70 5.23 1.96 1.78
Al2O3 12.93 16.27 13.57 14.18 13.65 Nb 4.95 5.85 17.6 11.0 20.2
TFe2O3 12.63 10.44 12.73 12.83 14.36 Ta 0.44 0.56 1.30 1.31 1.55
MgO 7.72 8.02 5.11 6.12 7.91 La 8.48 7.55 30.2 11.3 18.3
CaO 8.50 8.25 5.21 10.01 7.48 Ce 17.8 18.1 68.8 25.5 42.8
Na2O 3.94 3.63 3.00 2.49 3.07 Sr 121 152 271 308 114
K2O 2.22 1.37 1.88 2.45 0.11 Nd 14.2 13.6 41.5 15.2 26.1
P2O5 0.13 0.14 0.56 0.12 0.26 P 654 699 2380 555 1050
MnO 0.22 0.15 0.17 0.20 0.23 Zr 99.5 107 363 102 189
TiO2 1.73 1.67 2.21 1.71 2.78 Hf 2.34 1.09 5.05 1.74 3.84
LOI 1.99 2.83 3.03 3.63 3.56 Eu 1.75 1.56 3.68 1.60 2.23
Totel 99.44 99.99 99.52 99.60 99.13 Ti 10380 10020 13260 10260 16680
Na2O+K2O 6.16 5.00 4.88 4.94 3.18 Y 30.1 25.6 68.6 25.2 32.6
Mg# 55.01 60.58 44.54 48.83 52.42 Yb 2.77 2.23 6.29 1.87 2.52
Rb 53.0 45.1 29.4 34.2 38.0 Lu 0.45 0.36 1.06 0.28 0.33
Table 1  变玄武岩主量(10-2)、微量元素(10-6)分析结果
Fig.3  推测深大断裂展布区域变玄武岩微量元素蛛网(a)与Zr-Zr/Y图解(b)
Fig.4  勉略宁西部高精度磁测与断裂构造推断解释
a—ΔT等值线;b—ΔT上延500 m等值线;c—ΔT化极推断断裂构造;d—ΔT化极0°方向水平一阶导数断裂构造;e—ΔT化极垂向一阶导数断裂构造;f—磁法综合推断断裂构造位置
Fig.5  P14地面高精度磁测ΔT剖面
Fig.6  碧口东部1:50万区域重力等值线(据文献[13]修改)
Fig.7  勉略宁西部Ti(a)、Fe2O3(b)、V(c)地球化学异常
Fig.8  勉略宁西部遥感解译
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