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地壳的熔融受控于地壳的岩石成分、减压作用、外来水的加入和地壳内部的地温条件等众多因素,其中确定熔融所需热量的来源至关重要。本文简要回顾了板内环境下地壳熔融和酸性岩浆起源的相关研究,总结了引发地壳熔融热源的热源问题。目前一般认为地壳熔融是由底侵的高温幔源岩浆引发的,这种观点得到多学科资料的支持。不过底侵观点未能很好地解释大规模基性和酸性岩浆作用之间存在的显著不相关性和S型花岗岩的成因,相关数值模拟结果也高估了岩浆侵入所能引发的地壳熔融规模。本文提出岩石圈的不均一拉张和地表拉张裂谷内沉积物的快速加积可使地壳内部形成较高的地温梯度,进而造成以变沉积岩为主要成分的上地壳的大规模熔融和相关S型酸性岩浆作用的发生。
The melting of the crust is governed by rock components in the crust, pressure relief, the addition of extraneous water and the geothermal conditions inside the crust, among which the source of the heat required for melting is crucial. This paper briefly reviews the relevant studies on the origin of crustal melting and acidic magma under the in-plane environment and summarizes the heat sources that cause crustal melting heat sources. It is generally accepted that crustal melting is caused by the intrusion of high-temperature mantle-derived magma, a view supported by multidisciplinary data. However, the under-invasion viewpoints did not explain the significant irrelevance between large-scale basic and acidic magmatism and the genesis of S-type granites. The correlation numerical simulation also overestimated the crustal melting scale that magma invaded . This paper proposes that the non-uniform extension of the lithosphere and the rapid accretion of sediments in the surface tension rift can lead to the formation of a higher geothermal gradient in the crust, leading to the large-scale melting of the upper crust with the altered sedimentary rocks and the related S Type acidic magmatism.