The 3-D geometry of the Linglong granitic complex from 2-D gravity forward modeling, Shandong Province, east China

Author:

Zeng Hualin1,Wan Tianfeng2,Teyssier Christian3,Yao Changli1,Tikoff Basil4

Affiliation:

1. China Univ. of Geosciences (Beijing), Dept. of Applied Geophysics, 29 Xueyuan Road, Beijing 100083, China. Emails:

2. China Univ. of Geosciences (Beijing), Dept. of Geol. and Mineral Resources, 29 Xueyuan Road, Beijing 100083, China.

3. Univ. of Minnesota, Dept. of Geology and Geophysics, 108 Pillsburg Hall, 310 Pillsburg Dr. S.E., Minneapolis, Minnesota 55455.

4. Univ. of Wisconsin, Dept. of Geology and Geophysics, 1215 W. Dayton Street, Madison, Wisconsin 53706.

Abstract

The 3-D geometry of the Linglong granitic complex, Shandong Province, east China, is derived from 2-D gravity forward modeling constrained by geological data. A study of the geometry of the granite body at depth is particularly significant to better understand emplacement mechanisms and to guide gold exploration. The geometry of the granitic complex is analyzed using 2-D gravity forward modeling, constrained by the outcrops of the granites along each modeled profile. Anomalies along the profile were modeled using an interactive program derived from 2-D forward‐modeling techniques. The results show the Linglong granitic complex is a sheet‐like body of 3100 km2 in areal extent and a maximum thickness of 8 km. It is not a deeply rooted batholith as previously inferred.

Publisher

Society of Exploration Geophysicists

Subject

Geochemistry and Petrology,Geophysics

Reference12 articles.

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2. Audrain, J., Amice, M., Vigneresse, J. L., and Bouchez, J. L., 1989, Gravimetry and three‐dimensional geometry of the Cabeza de Araya granite pluton (Extremadura, Spain): C. R. Acad. Sci. Paris, 309, 1757–1764.

3. Chen, G., Sun, D., Zhou, X., Shao W., Gong, R., and Shao, Y., 1993, Genetic mineralogy and gold mineralization of Guojialing granodiorite in Jiaodong region (in Chinese): China Univ. Geosci. Press.

4. Gu, L., Wan, G., Duan, L., Jiang, T., Niu, R., and Yin, D., 1992, The assessment of geological, geophysical and geochemical exploration model and expecting of gold deposits for fracture‐alternative type in Jiadong, eastern Shandong (in Chinese): Shandong Inst. Geophys. Geochem. Expl. report 90051-09-02, 99–101.

5. Hu, S., Wang, S., Sang, H., Qiu, J., and Zhang, R., 1987, The isotopic ages and their geological significance in Linglong and Guojialing plutons, Shandong (in Chinese): Acta Petrolog. Sinica, 3, 83–89.

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