伊格莱西亚盆地(阿根廷圣胡安),地震解释,几何盆地和地热系统的含义

IF 0.9 4区 地球科学 Q3 GEOLOGY
Marcos Podesta, Paola G. Orozco, P. Alvarado, F. Fuentes
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引用次数: 2

摘要

圣胡安省的伊格莱西亚盆地是新生代背负盆地(Iglesia Calingasta Uspallata盆地)的北部,位于阿根廷西部活动平板俯冲带的上方。该盆地位于两个山脉之间,即西部的科迪勒拉前缘和东部的Precordirera,分别受到薄皮构造和厚皮构造的影响。它在南北方向上延长(70公里),最大宽度为35公里。我们分析了17条地震反射线,对应于500多公里的解释剖面。0.5-2s的强烈反射被解释为Agua Negra组(石炭系)上部的页岩和砂岩;这代表了伊格莱西亚盆地的地震基底,清楚地将分层(较浅)反射层与混沌(较深)反射层分隔开来。在已解释的地震线中已识别出几个高角度断层,这些断层影响了新近系填土甚至基底;其中一些与在地表观察到的结构有关,如El Tigre断层系统。三维模型显示,地下室的地震顶部在Pismanta地区下方顺利加深至3650米。基底继续向东延伸,坡度更陡,清楚地确定了盆地的不对称形状。此外,在皮斯曼塔中心的地热温泉周围有三个最大深度相似的沉积中心。一些已解释的断层可能有助于正常地热梯度加热的大气降水的流出过程。考虑到地震数据框架,我们的观测结果与可能与El Tigre断层系统有关的转挤压变形相关,该断层系统影响伊格莱西亚群的新近纪和更新世地层。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Iglesia basin (San Juan, Argentina), seismic interpretation, geometry basin, and implications for geothermal systems
The Iglesia basin, in the San Juan Province, is the northern part of a Cenozoic piggy-back basin (the Iglesia-Calingasta-Uspallata basin), located above of the active flat-slab subduction zone of western Argentina. This basin is located between two mountain ranges, the Cordillera Frontal to the west and the Precordillera to the east, affected by thin and thick skinned tectonics, respectively. It is elongated in a north-south direction (70 km) and has a maximum width of 35 km. We have analyzed 17 seismic reflection lines corresponding to more than 500 km of interpreted sections. A strong reflection at 0.5-2 s is interpreted as indicative of shales and sandstones in the upper part of the Agua Negra Formation (Carboniferous); this represents a seismic basement for the Iglesia basin clearly separating stratified (shallower) from chaotic (deeper) reflectors. Several high angle faults have been recognized in the interpreted seismic lines affecting the Neogene fill and even the basement; some of them correlate with structures observed at the surface such us El Tigre Fault System. A 3D model shows the seismic top of basement smoothly deepening down to 3,650 m beneath the Pismanta area. The basement continues upward to the east with a steeper slope clearly defining an asymmetrical shape for the basin. Moreover, there are three depocenters of similar maximum depths around the geothermal hot spring of the Pismanta center. Some of the interpreted faults may be helping in the outflow process of meteoric water heated by a normal geothermal gradient. Considering earthquake data framework, our observations correlate with transpressive deformation likely associated with El Tigre Fault System, which affects Neogene and Pleistocene strata of the Iglesia Group.
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来源期刊
Andean Geology
Andean Geology 地学-地质学
CiteScore
3.90
自引率
0.00%
发文量
17
审稿时长
>12 weeks
期刊介绍: This journal publishes original and review articles on geology and related sciences, in Spanish or English, in three issues a year (January, May and September). Articles or notes on major topics of broad interest in Earth Sciences dealing with the geology of South and Central America and Antarctica, and particularly of the Andes, are welcomed. The journal is interested in publishing thematic sets of papers and accepts articles dealing with systematic Paleontology only if their main focus is the chronostratigraphical, paleoecological and/or paleogeographical importance of the taxa described therein.
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