气候变化领域集成服务门户(CCPortal): Sediment fill geometry and structural control of the Pampa del Tamarugal basin, northern Chile

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DOI	10.1130/B31722.1
	Sediment fill geometry and structural control of the Pampa del Tamarugal basin, northern Chile
	Labbé N.; García M.; Simicic Y.; Contreras-Reyes E.; Charrier R.; De Pascale G.; Arriagada C.
发表日期	2019
ISSN	167606
起始页码	155
结束页码	174
卷号	131 期号:2021-01-02
英文摘要	Determination of the sediment fill geometry and structure of basins along the western flank of the Central Andes is crucial for understanding the regional tectonic evolution and the geological situation of natural resources. In this study, we developed a sediment- thickness distribution model for the Pampa del Tamarugal basin (between 20°20'S and 21°30'S, northern Chile), from surface geological information, available wells, and interpretation and depth conversion of 14 seismic-reflection profiles. Four Oligocene- Holocene units and one Carboniferous-Eocene undifferentiated basement unit were identified in the seismic profiles. For depth conversion, we established an empirical velocity model using P-wave velocities measured from rock samples, with velocity values from 2 to 6 km/s. By interpolating the basal-fill surface from the processed data set, and subtracting it from the topographic surface, we generated an isopach map of the basin, which has a maximum fill thickness of 1566 m. Four N-S-elongated asymmetric subbasins with a fill exceeding 700 m in thickness were identified, and these are separated by four basement highs. Both basement and fill units are folded and cut by west-vergent high-angle reverse faults, which originated before the Oligocene and were reactivated in the Miocene. During the isopach map construction, three sources of error were identified (i.e., topographic adjustment, interpretation, and conversion method), and the mean accumulated thickness error was found to be ±250 m; in addition, the lack of wells as validation data also contributes to the uncertainty. Based on our results, the basin-fill geometry was controlled by both compressional tectonics, which generated uplifted blocks and accommodation spaces, and desertification, which has significantly decreased the sediment input since the late Miocene. Despite the uncertainties, our results provide new insights into Andean tectonics and may be used as a screening tool for natural resources such as minerals and groundwater. © 2018 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184969
作者单位	Advanced Mining Technology Center, Universidad de Chile, Avenida Tupper 2007, Santiago, Chile; Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile; Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Avenida Blanco Encalada 2002, Santiago, Chile; Escuela de Ciencias de la Tierra, Universidad Andres Bello, Sazié 2119, Santiago, Chile
推荐引用方式 GB/T 7714	Labbé N.,García M.,Simicic Y.,et al. Sediment fill geometry and structural control of the Pampa del Tamarugal basin, northern Chile[J],2019,131(2021-01-02).
APA	Labbé N..,García M..,Simicic Y..,Contreras-Reyes E..,Charrier R..,...&Arriagada C..(2019).Sediment fill geometry and structural control of the Pampa del Tamarugal basin, northern Chile.Bulletin of the Geological Society of America,131(2021-01-02).
MLA	Labbé N.,et al."Sediment fill geometry and structural control of the Pampa del Tamarugal basin, northern Chile".Bulletin of the Geological Society of America 131.2021-01-02(2019).