Tectonic units of the Early Precambrian basement within the North China Craton: Constraints from gravitational and magnetic anomalies

Jiang Suhua; Cao Wei; Li Sanzhong; Wang Gang; Somerville Ian; Zhang Wen; Zhao Feiyu; Chen Hongyan

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Tectonic units of the Early Precambrian basement within the North China Craton: Constraints from gravitational and magnetic anomalies

机译：中国北方克拉顿省早期前锋利亚地下室的构造单位：引力和磁异常的约束

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The tectonic divisions of the North China Craton (NCC) basement has always been a hot and yet unresolved topic. We collected the latest gravity and magnetic data, and then used a two-dimensional discrete wavelet transform method to decompose the Bouguer gravity anomaly of the NCC into the 1st to 8th Approximations and Details, respectively. We then compared the dynamic tectonic division schemes with the gravity and magnetic division schemes for the Precambrian basement at the end of the Neoarchean and Archean. Our results show that the 2nd-order Detail field of the Bouguer gravity anomalies is well consistent with the Paleoproterozoic tectonic divisions of the NCC by Zhao et al. (2005), for it clearly outlines the 3-unit layout of the Eastern and Western blocks and the central Trans-North China Orogen, with some anomalous zones identically trending with the dike swarms. Faults and volcanic rocks generally produce magnetic anomalies, but the main anomalous zones in the magnetic field are merely distributed around the plate boundaries of the NCC. It may indicate that the amalgamation of the NCC was mostly completed in the Paleoproterozoic. The 5th-order Detail field of Bouguer gravity anomalies of the NCC corresponds well with its tectonic division at the end of the Neoarchean, for it well reflects the general boundaries and axial trends of the Archean units. These Archean units are mainly separated into three Paleoproterozoic tectonic units by Paleoproterozoic tectonic boundaries, respectively. The magnetic anomalies within the Western and Eastern blocks have separately similarities with the Trans-North China Orogen. The 6th-order Detail fields, however, match well the boundaries of the 10 continental nucleii of the Archean NCC, but the anomalous distributions in the 6th-order Detail are also divided by the Paleoproterozoic tectonic borders. In view of the gravity and magnetic anomalies, it further reveals that the NCC basement may have experienced a dynamic evolutio

机译：华北克拉顿（NCC）地下室的构造分裂一直是一个炎热且尚未解决的主题。我们收集了最新的重力和磁数据，然后使用二维离散小波变换方法分别将NCC的Bouguer重力异常分解为第一至第8°近似和细节。然后，我们将动态构造划分方案与NeoArchean和Archean结束时的前锋地下室的重力和磁力分裂方案进行了比较。我们的研究结果表明，Bouger Gravity异常的2nd订购详细领域与Zhao等人的NCC古普罗佐的构造分裂很好。（2005年），因为它清楚地概述了东部和西部块的3单元布局和中央跨北造山区，一些异常区域与堤防群体相同培训。故障和火山岩通常产生磁异常，但磁场中的主要异常区域仅仅围绕NCC的板界分布。它可能表明，NCC的胺化大多在古普罗科奇中完成。 NCC的Bouguer重力异常的第五阶细节领域与NeoArchean末端的构造分裂很好地相对应，因为它很好地反映了Archean单元的一般界限和轴向趋势。这些Archean单元主要分为古普罗佐的构造边界分为三个古地形杂交构造单元。西部和东部块内的磁异常与跨北奥根根分别相同。然而，第6个阶详细领域匹配了Archean NCC的10个大陆核的边界，但第6阶细节中的异常分布也除了古木典可的构造边界。鉴于重力和磁性异常，它还揭示了NCC地下室可能经历了动态Evolutio

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来源
《Precambrian Research》 |2018年第2018期|共11页
作者
Jiang Suhua; Cao Wei; Li Sanzhong; Wang Gang; Somerville Ian; Zhang Wen; Zhao Feiyu; Chen Hongyan;
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作者单位

Ocean Univ China MOE Key Lab Submarine Geosci &

Prospecting Tech Qingdao 266100 Peoples R China;

Ocean Univ China MOE Key Lab Submarine Geosci &

Prospecting Tech Qingdao 266100 Peoples R China;

Ocean Univ China MOE Key Lab Submarine Geosci &

Prospecting Tech Qingdao 266100 Peoples R China;

Ocean Univ China MOE Key Lab Submarine Geosci &

Prospecting Tech Qingdao 266100 Peoples R China;

Univ Coll Dublin UCD Sch Earth Sci Dublin 4 Ireland;

Ocean Univ China MOE Key Lab Submarine Geosci &

Prospecting Tech Qingdao 266100 Peoples R China;

Ocean Univ China MOE Key Lab Submarine Geosci &

Prospecting Tech Qingdao 266100 Peoples R China;

Ocean Univ China MOE Key Lab Submarine Geosci &

Prospecting Tech Qingdao 266100 Peoples R China;

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原文格式 PDF
正文语种 eng
中图分类前寒武纪;
关键词
North China Craton; Archean; Paleoproterozoic; Tectonic unit; Gravity anomaly; Magnetic anomaly;

机译：华北克拉顿;Archean;古普罗科奇;构造单元;重力异常;磁异常;

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1. Tectonic units of the Early Precambrian basement within the North China Craton: Constraints from gravitational and magnetic anomalies [J] . Jiang Suhua, Cao Wei, Li Sanzhong, Precambrian Research . 2018,第期

机译：中国北方克拉顿省早期前锋利亚地下室的构造单位：引力和磁异常的约束
2. Magnetic fabric constraint on tectonic setting of Paleoproterozoic dyke swarms in the North China Craton, China [J] . Yan Yonggang, Chen Liwei, Huang Baochun, Precambrian Research . 2019,第期

机译：中国古典古代堤防构造结构的磁性织物约束
3. Paleo-position of the North China craton within the supercontinent Columbia: Constraints from new paleomagnetic results [J] . Xu Huiru, Yang Zhenyu, Peng Peng, Precambrian Research . 2014,第Pta1期

机译：华北克拉通在超大陆内的古位置：来自新古磁结果的限制
4. Tectonic Correlation of the Precambrian Evolution of the North China Craton with the Baltic Shield [C] . Xianglin Qian International GeologicalCongress . 1997

机译：北中国克拉登与波罗的海盾的前兆关系的构造相关性
5. PALEOMAGNETIC CONSTRAINTS ON EXTENSION IN THE BASIN AND RANGE AND IN THE NORTH ATLANTIC AREA (SIERRA NEVADA, GREAT VALLEY SEQUENCE, CALIFORNIA, TECTONICS, COAST RANGE OPHIOLITE). [D] . FREI, LEAH SHIMONAH. 1986

机译：古磁约束着盆地和范围以及北大西洋区域（塞拉内华达，大谷序列，加利福尼亚，构造，海岸蛇绿岩）的伸展。
6. First Precambrian palaeomagnetic data from the Mawson Craton (East Antarctica) and tectonic implications [O] . Yebo Liu, Zheng-Xiang Li, Sergei A. Pisarevsky, -1

机译：莫森克拉通（南极东部）的第一个前寒武纪古地磁数据及其构造意义
7. Insights into the tectonic evolution of the North China Craton through comparative tectonic analysis: A record of outward growth of Precambrian continents [O] . Kusky T.M., Polat A., Windley B.F., 2016

机译：通过比较构造分析洞察华北克拉通的构造演化：前寒武纪大陆向外生长的记录

Tectonic units of the Early Precambrian basement within the North China Craton: Constraints from gravitational and magnetic anomalies

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