Thermal Structure Beneath the Tarim Craton and Its Tectonic Implications
Thermal Structure Beneath the Tarim Craton and Its Tectonic Implications
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塔里木克拉通地下热结构及其构造意义
DOI：
10.3389/feart.2021.700114
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发表时间：
2021-08
影响因子：
2.9
通讯作者：
Baodi Wang
中科院分区：
文献类型：
--
作者：
Xi Xu;Shengqing Xiong;Akiko Tanaka;Qiang Zheng;Xingtao Kuang;Xiaoying Zhu;Daoqing Zhou;Qifang Zheng;Jianhua Wan;Xuezhong Yu;Baodi Wang
利用中国大陆最新的高分辨率航磁资料，经EMAG 2放大后，利用谱分析方法估算了塔里木盆地及其周边地区磁层的横向分布。作为一个代理，居里点深度（CPD）提供了一个全面的看法，地壳尺度的热制度，占磁铁矿成为顺磁性的深度，和对应的CPD与构造制度表明，CPD是有用的划定区域地壳热结构。此外，CPD的横向变化提供了有用的见解，塔里木盆地及其周边地区的岩石圈热状态，并可以与古老的和活跃的构造，如地热活动，地震活动，和矿物-石油生成。在塔里木盆地内部，覆盖巴楚盆地及其周边地区的北西向域对应于该地区最小的磁CPD特征几何体，这很可能与二叠纪塔里木地幔柱-岩石圈相互作用有关。相反，其他领域的特点是大CPD值（高达50公里），这是由前寒武纪基底没有二叠纪岩浆活动的修改。此外，CPD估计值与地表热流测量值呈负相关，这有助于确定矿床和油气田的潜在区域。地震主要集中在居里面的梯度区和过渡区，表明地壳热结构的这些突变域是地震发生的次要机制。
The lateral distribution of the magnetic layer beneath the Tarim Craton and its environs was estimated from spectral analysis using the newest high-resolution aeromagnetic dataset of mainland China, which is enlarged by EMAG2. As a proxy, the Curie point depth (CPD) provides a comprehensive view of a crust-scale thermal regime, accounted for the depth at which magnetite becomes paramagnetic, and the correspondence of the CPD with the tectonic regime indicates that the CPD is useful for delineating the regional crustal thermal structure. Furthermore, lateral variations in CPD provide useful insights into the lithospheric thermal state of the Tarim Craton and its surrounding areas and can be related to ancient and active tectonics, such as geothermal activity, seismicity, and mineral-petroleum generation. In the Tarim interior, the NW domain covering the Bachu Uplift and its surrounding areas corresponds to the minimum magnetic CPD signature geometry of this area, which is most likely linked to the Permian Tarim plume-lithosphere interaction. In contrast, the other domains are characterized by large CPD values (up to 50km), which are floored by a Precambrian basement without the Permian magmatism modification. Moreover, the estimated CPD values are consistent with surface heat flow measurements with an inverse correlation, which can assist in identifying the potential area for mineral deposits and hydrocarbon fields. Earthquakes are mostly concentrated in the gradient and transition zones of the Curie surface, suggesting that these abrupt variation domains in the crustal thermal structure act as a secondary mechanism for earthquake generation.
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