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Non-seismic geophysical analysis of potential geothermal resources in the longgang block,Northeast China

Earth and Planetary Physics 2022年第6期6卷 576-591页

作者： HaiYan Liu Chong Peng LinFu Xue WenQing Li ChunHui Xu Cremilda Samuel Jofrisse College of Earth Sciences Jilin UniversityChangchun 130061China College of Geographical Sciences Shanxi Normal UniversityTaiyuan 030031China Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China College of Geo-exploration Science and Technology Jilin UniversityChangchun 130026China School of GeoSciences University of EdinburghEdinburgh EH93JWUK College of Tourism and Geographical Sciences Jilin Normal UniversitySiping Jilin 136000China

Although geothermal energy has many clear advantages,including its sustainability and environmentally friendly nature,research into potential geothermal resources across the longgang block,Northeast China,has been *** we present the first analysis of the potential geothermal resources in this region that employs joint geological and non-seismic geophysical methods to identify target areas that may be economically *** acquire and analyze high-precision gravity,magnetic,and magnetotelluric sounding data,which are constrained using the petrophysical parameters of outcropping rocks across the longgang block,to conduct a comprehensive evaluation of the region’s deep geological structures and their geothermal resources potential,with a focus on identifying faults,rock masses,and thermal storage *** find that Archean granitic gneiss and Mesozoic rock masses in the deeper section of the longgang block possess weak gravity anomalies and high *** also identify thermal storage structures near these deeper geological units based on their extremely low *** data are used to infer the dip and depth of known or hidden faults,to constrain the spatial distribution of intrusive rock masses,and to determine the spatial distribution of subsurface thermal storage *** potential of the target areas for geothermal resources exploitation is divided into three grades based on contact depths between faults and thermal storage structures,and the scale of their thermal storage *** results suggest that a joint non-seismic geophysical approach can be effective in locating and evaluating geothermal resources in complex geological settings.

关键词： longgang block geothermal resources Anshan−Benxi area petrophysical parameters magnetotelluric sounding

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Metamorphic P-T conditions and zircon U-Pb ages of amphibolite in Laojinchang area,southern Jilin Province

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Global Geology 2024年第2期27卷 76-92页

作者： LI Meihui ZHENG Changqing LIANG Chenyue College of Earth Sciences Jilin UniversityChangchun 130061China Key Laboratory of Mineral Resources Evaluation of Northeast Asia Ministry of Natural ResourcesChangchun 130061China

The longgang block is one of the most important parts of the eastern North China Craton,characterized by extensive Late Neoarchean(~2.5 Ga)granulite facies ***,it remains uncertain whether it was influenced by Paleoproterozoic *** authors provide a comprehensive analysis of amphibolite in Laojinchang area,southern Jilin Province,through petrographic,geochemical,mineralogical,and zircon *** main findings are as follows:The mineral assemblage of amphibolite is Hb+Pl+Cpx+Bi+Kf+Q,characteristic of amphibolite facies;zircon U-Pb dating indicates that the metamorphic age of amphibolite is 1834±33 Ma;the amphibolite has geochemical characteristics of calcium alkaline,with depletion of Nb,Ta,Ti and *** plagioclase in the amphibolite is oligoclase,belonging to acidic *** is speculated that the protolith of the amphibolite is diorite;using geothermobarometer,the peak metamorphic P-T conditions of amphibolite are determined to be 536–593℃/3.4–5.0 kbar,and the post-peak conditions are 429–566℃/1.3–3.1 *** above results indicate that the Paleoproterozoic metamorphism has been superimposed on longgang block,linked to a new orogenic event on the northern edge of North China Craton.

关键词： North China Craton longgang block amphibolite Paleoproterozo ic metamorphism

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