Heat flow in the Altai-Sayan Area: new data

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• 作者：L.S. Sokolova ; A.D. Duchkov
• 关键词：Heat flow ; temperature log ; thermal gradient ; thermal conductivity ; radiogenic heat flow ; helium isotope ratio ; Altai-Sayan Folded Area
• 刊名：Russian Geology and Geophysics
• 出版年：2008
• 出版时间：December 2008
• 年：2008
• 卷：49
• 期：12
• 页码：940-950
• 全文大小：407 K

文摘

Eleven new estimates of heat flow (q) from the southern Altai-Sayan Folded Area (ASFA) have provided update to the heat flow map of Gorny Altai. Measured heat flow in the area varies from 33 to 90 mW/m², with abnormal values of >70 mW/m^q at four sites. The anomalies may have a deep source only at the Aryskan site in the East Sayan (q = 77 mW/m²) while high heat flows of 75–90 mW/m² obtained for the Mesozoic Belokurikha and Kalguty plutons appear rather to result from high radiogenic heat production in granite, which adds a 25–30 W/m² radiogenic component to a deep component of 50–60 mW/m². The latter value is consistent with heat flow estimates derived from helium isotope ratios (54 mW/m² in both plutons). Heat flow variations at other sites are in the range from 33 to 60 mW/m². The new data support the earlier inferences of a generally low heat flow over most of ASFA (average of 45–50 mW/m²) and of a “cold” Cenozoic orogeny in the area (except for southeastern ASFA), possibly driven by shear stresses associated with India indentation into Eurasia.