摘要
鄂尔多斯盆地系统Ｕ、Ｋ、Ｔｈ含量和地壳结构分层的综合研究表明，盆地莫霍面的热流平均值为０．３７ＨＦＵ，比华北地洼型活化盆地（０．６４～０．９７ＨＦＵ）要低得多，尚有稳定构造区的热流特点。盆地地表平均热流值为１．４４６ＨＦＵ，与全球大陆中生代地洼型造山区（１．４５ＨＦＵ）很接近，说明鄂尔多斯残留地台型盆地，从大地构造性质角度上看，正趋于向活化的方向发展。从地表到莫霍面，各界面现今热流的分布形式一致，热流的变化梯度和趋势也一致，表明研究区热流场的表现形式，受上地幔热场格局的控制。盆地各界面现今热流北西低、南东高，在吴旗－靖边及其往两端延伸一线，存在一个明显的ＮＥＥ向梯度带，是油气在热动力驱使下而分散或富集的重要场所。
This paper focuses on the heat flow field of Ordos basin, NW China,by combining experlrnent methods of U,Kand Th, heat generation, etc. In the light of the comprehensive study of the experimental data and layer divisions of the crust,the average heat flow of Moho in Ordos basin is 0.37 HPU,much lower than that(0. 64～0. 97 HFU)in North China basin or that(1. 19 HFU) in Songliao basin, NE China, showing the characteristics of the heat flow field of the stable cratonic basin. The average heat flow on the crust surface of the basin is about 1.446 HFU,similar with that in Mesozoic diwa orogeny of the world, probably indicating that the diwa stage is soon expected in the basin. The interfaces from Moho to the surface in Ordos basin have the same heat flow distribution-style with their high anomaly in the SE part,low anomaly in the NW part and NE-trending transition zone from Wuqi to Jingbian. In the transition zone,the geothermal dynamics plays the most important role for accumulation of petroleum.
出处
《大地构造与成矿学》
EI
CAS
CSCD
1996年第1期29-37,共9页
Geotectonica et Metallogenia
