“continental crust”的概念、定义、翻译、参考文献-科学参考

continental crust

Geology and Earth Sciences

That portion of the Earth’s surface overlying the Mohorovičić discontinuity, and with an average density of 2700–3000 mg/m³. The thickness is variable, mostly 30–40 km, except for areas of recent mountain building where the thickness can be 70 km. The crust comprises two layers, but the boundary between them is poorly defined. The upper layer is of granitic composition with surface enrichment in radiogenic and other lithophile elements, and has an average density of 2700 mg/m³. The lower layer was previously considered to be of gabbroic composition but is now thought to be quartz diorite in granulite metamorphic grade.

Geography

The outer, rigid surface of the Earth which forms the continents. Wilde et al. (2001) Nature 409, 175–8 find evidence for the existence of continental crust on the Earth 4.4 gigayears ago. Continental crust is rich in feldspars and granitic rocks and about 35 km thick (Gao et al. (1998) Geochimica et Cosmochimica Acta 62, 11)—thicker, but less dense, on average, than oceanic crust. Collins (2002) Geology 30, 6 explains the role of cycles of tectonic switching in the production of continental crust. Crust-mantle interactions occur in the lower continental crust (Yang et al. (2007) Prog. Nat. Sci. 17, 2).

单词	continental crust
释义	continental crust Geology and Earth Sciences That portion of the Earth’s surface overlying the Mohorovičić discontinuity, and with an average density of 2700–3000 mg/m³. The thickness is variable, mostly 30–40 km, except for areas of recent mountain building where the thickness can be 70 km. The crust comprises two layers, but the boundary between them is poorly defined. The upper layer is of granitic composition with surface enrichment in radiogenic and other lithophile elements, and has an average density of 2700 mg/m³. The lower layer was previously considered to be of gabbroic composition but is now thought to be quartz diorite in granulite metamorphic grade. Geography The outer, rigid surface of the Earth which forms the continents. Wilde et al. (2001) Nature 409, 175–8 find evidence for the existence of continental crust on the Earth 4.4 gigayears ago. Continental crust is rich in feldspars and granitic rocks and about 35 km thick (Gao et al. (1998) Geochimica et Cosmochimica Acta 62, 11)—thicker, but less dense, on average, than oceanic crust. Collins (2002) Geology 30, 6 explains the role of cycles of tectonic switching in the production of continental crust. Crust-mantle interactions occur in the lower continental crust (Yang et al. (2007) Prog. Nat. Sci. 17, 2).
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