| 中国陆域居里等温面深度特征 |
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| 引用本文： | 熊盛青,杨海,丁燕云,李占奎.中国陆域居里等温面深度特征[J].地球物理学报,2016,59(10):3604-3617. |
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| 作者姓名： | 熊盛青 杨海 丁燕云 李占奎 |
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| 作者单位： | 1.中国国土资源航空物探遥感中心, 北京 100083;2.国土资源部航空地球物理与遥感地质重点实验室, 北京 100083 |
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| 基金项目： | 国家地质矿产调查评价专项“中国陆域航磁特征及地质构造研究”项目（1212011087009）与国家863主题项目“航空地球物理遥感综合探测技术与解释系统研究”课题（2013AA063905）联合资助. |
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| 摘 要： | 基于最新编制的1/100万全国航陆域磁异常图数据,采用功率谱法对中国陆域的居里点深度进行了估算,获得了8004个居里点深度,完成了中国陆域居里面深度图的编制,首次完整的展现了中国陆域的居里面起伏特征.研究表明,居里面在稳定地块表现为坳陷,埋深为28~45km,如塔里木盆地,准噶尔盆地,柴达木盆地,可可西里—巴颜喀拉坳陷区,扬子盆地区,华北盆地区,松辽盆地,二连盆地,巴彦浩特—武威—潮水盆地,珠江口—琼东南盆地等.华北盆地区的居里面深度与塔里木陆块和扬子陆块有较大的差异,相对偏浅,这可能与华北陆块遭受了复杂的后期改造,导致软流圈上隆和岩石圈减薄有关.可可西里—巴颜喀拉地块是青藏高原北部发育的呈NWW向展布的巨型居里面坳陷带,其原因是该地区发育大面积的三叠系沉积地层和较少的岩浆活动,这些稳定的地块都具有莫霍面隆起和居里面坳陷的特征.在活动频繁的造山带居里面以隆起为特征,埋深为18~26km,如东北部山岭区、西北部山岭区、秦岭—大别山地区、西昆仑—西藏—三江—康滇地区、东南沿海地区等.这反映了构造运动及岩浆活动所引起的地壳地温梯度的差异.根据我国816个大地热流数据,对比研究居里面深度与地温梯度和大地热流的关系,结果显示居里面深度与热流值并非线性关系,居里面深度大于30km时,热流值较低,均小于100mW·m~(-2);在居里面深度小于30km的地区,热流值变化范围较大.并且,随着热流值的升高,热流值有向中国东部沿海、藏南—三江地区、秦岭—大别地区、辽东等集中的趋势,这些地区都呈现出居里面隆起的特征,是地热资源勘探开发的重要远景区.
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| 关 键 词： | 居里等温面 大地构造 大地热流 功率谱法 地热 中国陆域 |
| 收稿时间： | 2015-10-10 |
Characteristics of Chinese continent Curie point isotherm |
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| XIONG Sheng-Qing,YANG Hai,DING Yan-Yun,LI Zhan-Kui.Characteristics of Chinese continent Curie point isotherm[J].Chinese Journal of Geophysics,2016,59(10):3604-3617. |
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| Authors: | XIONG Sheng-Qing YANG Hai DING Yan-Yun LI Zhan-Kui |
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| Institution: | 1.China Aero Geophysical Survey & Remote Sensing Center for Land & Resources, Beijing 100083, China;2.Key Laboratory of Airborne Geophysics and Remote Sensing Geology, Ministry of Land and Resources, Beijing 100083, China |
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| Abstract: | Based on the latest compiled 1/100 million aeromagnetic map data, the Curie point depth was estimated by power spectrum method. The calculation obtained 8004 Curie point depth values in Chinese continent. Eventually, we completely compiled the Chinese continental Curie point isotherm map. This map first fully shows the characteristics of Chinese continental Curie point depth. The study shows that Curie point isotherm is characterized by depression inside the stable blocks with the depth of 28~45 km, such as the Tarim Basin, Junggar Basin, Qaidam Basin, Hoh Xil-Bayan Har Depression area, the Yangtze Basin area, North China basin area, Songliao Basin, Erlian Basin, Bayan-Wuwei-Chaoshui basin, Pearl River Estuary-southeast Hainan basin. The Curie depth of North China basin area is shallower than Tarim continent block and Yangtze continent block, which may be related to North China block suffered a complex post-transformation and resulted in the asthenosphere upwelling and lithospheric thinning. Hoh Xil-Bayan Har block is a NWW trending Curie point isotherm depression area lies within western Tibetan Plauteau, because the area developed a large area of the Triassic sedimentary and less magmatism. The stable blocks coincidently have Moho uplift and Curie point isotherm depression. Conversely, the Curie point isotherm of active orogenic belt is characterized by uplift with the depth of 18~26 km, such as the Northeast mountain area, Northwest mountain area, Qinling-Dabie Mountain area, West Kunlun-Tibet-Sanjiang-Kangdian area, the southeast coastal areas and so on. The uplift reflects the geothermal gradient difference caused by tectonic and magmatic activities. A collection of 816 heat flow data from published literatures are applied to study the relationship between Curie point isotherm and heat flow. The results show that there is not a simply linear relationship between the depth and heat flow, however, when the depth is greater than 30 km, the heat flow values are less than 100 mW·m-2. While the Curie point depth is less than 30 km, the heat flow values are varied in a wide range. The high heat flow values are gathered to the east coast of China, southern Tibet-Sanjiang area, Qinling-Dabie area, east of Liaoning Province where are characterized by uplift of Curie point isotherm. These areas are prospects for future geothermal exploration. |
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| Keywords: | Curie point isotherm Tectonic Heat flow Power spectral method Geothermal Chinese continent |
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