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Interpretation of gravity–magnetic anomalies to delineate subsurface configuration beneath east geothermal province along the Mahanadi rift basin: a case study of non-volcanic hot springs
Geothermal Energy ( IF 4.2 ) Pub Date : 2022-04-22 , DOI: 10.1186/s40517-022-00216-4
Aurobindo Kumar Basantaray 1 , Animesh Mandal 1
Affiliation  

Gravity and magnetic studies have been carried out over a non-volcanic hot spring zone consisting of Atri and Tarabalo hot springs along the intracontinental Mahanadi rift basin to delineate the subsurface structures and to understand their effect on the geothermal activities over a stable continental region. Calculated gravity and magnetic anomaly maps unveil the presence of hot springs along Mahanadi fault. The four-layer subsurface configuration as observed using radially averaged power spectrum analysis and 3D Euler solutions of both gravity and magnetic data indicates occurrence of multi-phases sedimentation and tectonic events. 2D forward, 2D inverse, and 3D inverse residual gravity models have delineated high-density igneous intrusive bodies surrounded by comparatively less dense Khondalites and Charnockites rich altered zones. The sharp high to low density transition zones are identified as the regional Mahanadi fault. The India–Antarctica rifting, existence of two hot springs along the Mahanadi fault of the rifted basin, and similarity in water chemistry strongly indicates an interconnection between these two hot springs. Igneous intrusions and radiogenic element-rich metamorphosed shallow formations combinedly acting as the heat source. Deciphered altered zone, deeper intrusion and deeply connected regional fault along the hot springs confirmed that this regional fault is providing the major pathway for water circulation through radioactive element-rich altered zones while the local and shallow fractures connecting the Mahanadi fault feed the hot springs of the study area.

中文翻译:

解释重磁异常以描绘沿马哈纳迪裂谷盆地东部地热省下方的地下构造:以非火山温泉为例

重力和磁力研究已经在沿陆内马哈纳迪裂谷盆地的由 Atri 和 Tarabalo 温泉组成的非火山温泉带上进行,以描绘地下结构并了解它们对稳定大陆地区地热活动的影响。计算出的重力和磁异常图揭示了沿着马哈纳迪断层存在温泉。使用径向平均功率谱分析和重力和磁数据的 3D 欧拉解观察到的四层地下构造表明发生了多相沉积和构造事件。2D 正向、2D 反演和 3D 反残余重力模型描绘了高密度的火成岩侵入体,周围环绕着密度相对较低的孔达岩和富含 Charnockites 的蚀变带。尖锐的高密度到低密度的过渡带被确定为区域性的马哈纳迪断层。印度-南极洲裂谷、裂谷盆地马哈纳迪断层沿线存在两个温泉,以及水化学的相似性,强烈表明这两个温泉之间存在相互联系。火成岩侵入体和富含放射性元素的变质浅层地层共同作为热源。破译的蚀变带、更深的侵入和沿温泉深度连接的区域断层证实,该区域断层为富含放射性元素的蚀变带提供了水循环的主要通道,而连接马哈纳迪断层的局部和浅层裂缝则为温泉提供了水源。研究区域。印度-南极洲裂谷、裂谷盆地马哈纳迪断层沿线存在两个温泉,以及水化学的相似性,强烈表明这两个温泉之间存在相互联系。火成岩侵入体和富含放射性元素的变质浅层地层共同作为热源。破译的蚀变带、更深的侵入和沿温泉深度连接的区域断层证实,该区域断层为富含放射性元素的蚀变带提供了水循环的主要通道,而连接马哈纳迪断层的局部和浅层裂缝则为温泉提供了水源。研究区域。印度-南极洲裂谷、裂谷盆地马哈纳迪断层沿线存在两个温泉,以及水化学的相似性,强烈表明这两个温泉之间存在相互联系。火成岩侵入体和富含放射性元素的变质浅层地层共同作为热源。破译的蚀变带、更深的侵入和沿温泉深度连接的区域断层证实,该区域断层为富含放射性元素的蚀变带提供了水循环的主要通道,而连接马哈纳迪断层的局部和浅层裂缝则为温泉提供了水源。研究区域。火成岩侵入体和富含放射性元素的变质浅层地层共同作为热源。破译的蚀变带、更深的侵入和沿温泉深度连接的区域断层证实,该区域断层为富含放射性元素的蚀变带提供了水循环的主要通道,而连接马哈纳迪断层的局部和浅层裂缝则为温泉提供了水源。研究区域。火成岩侵入体和富含放射性元素的变质浅层地层共同作为热源。破译的蚀变带、更深的侵入和沿温泉深度连接的区域断层证实,该区域断层为富含放射性元素的蚀变带提供了水循环的主要通道,而连接马哈纳迪断层的局部和浅层裂缝则为温泉提供了水源。研究区域。
更新日期:2022-04-22
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