Temperature in the Crust Lijuan He Institute of Geology and Geophysics, Chinese Academy of Sciences.

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Presentation transcript:

Temperature in the Crust Lijuan He Institute of Geology and Geophysics, Chinese Academy of Sciences

Determining crustal temperature: What needs to be done? a. Equation b. Heat flow c. Radiogenic heat production d. Thermal conductivities of rocks

Temperature field of Earth and transient heat transfer equation

Effects of water circulation on temperature field Low-Medium temperature geothermal resources are widespread in the Southeast China Faults, detailed crustal structure

Boundary conditions From transient to steady

Determining crustal temperature: What needs to be done? a. Equation b. Heat flow c. Radiogenic heat production d. Thermal conductivities of rocks

(921)

Determining crustal temperature: What needs to be done? a. Equation b. Heat flow c. Radiogenic heat production d. Thermal conductivities of rocks

Vertical distribution of A in the crust the downward-decreasing exponential model The exponential distribution model for radiogenic heat production has seen widespread use and acceptance since it was first proposed by Lachenbruch (1968).

Implement of the continental scientific drilling made it possible to observe directly the detailed distribution of the heat production in the upper part of the crust, and to verify the heat production model of crust. There are more than 20 continental scientific drillings in the worldwide up to now, none of them has observed the downward-decreasing exponential distribution. Continental Scientific Drilling Project

the Kola superdeep well SG-3 (Popov et al., 1999)

(Pribnow and Winter, 1997) (He et al., 2009) KTB CCSD Continental Scientific Drilling Project

Multi-layer model

Radiogenic heat production in the Southeast China (Zhao et al., 1995) granite Meso- Cenozoic volcanic rocks Such large high-A area is rare in the global continents

Determining crustal temperature: What needs to be done? a. Equation b. Heat flow c. Radiogenic heat production d. Thermal conductivities of rocks

Detailed simulation of crustal temperature acquires deep understanding about heat flow, the crustal structure and the thermo-physical properties of rocks. 2D/3D numerical modeling of temperature field based on software

Parameters ValuesError ( %) Thermal thickness of L( %) T of Moho (%) Mantle Q(%) Heat flow 62 mW·m Thickness sediments2.5 km Upper-Mid crust22 km Lower crust14 km A sediments1.08 μW·m Upper-Mid crust1.1 μW·m Lower crust0.3μW·m Upper mantle0 μW·m μW·m K sediments2.2 W·m -1 K Upper-Mid crust2.56 W·m -1 K Lower crust2.6 W·m -1 K Upper mantle3.2 W·m -1 K Uncertainty analysis of thermal modeling

1. Importance of crustal thermal structure for Geo-neutrinos 2. Significance of Geo-neutrinos for secular cooling and thermal structure of earth: Provided that the crustal contribution to the geoneutrino flux can be very precisely calculated, it will be possible to put robust constraints on mantel radioactivity and its contribution to the Earth’s energy budget (Mareschal et al., 2012). Concluding remarks (Mareschal et al., 2012)