求翻译：因此大兴安岭北部地壳减薄的机制是, 早白垩世-始新世中国西部在挤压机制下地壳加厚形成青藏高原, 而中国东部在伸展环境中地壳减薄, 形成大规模(中) 酸性-中基性火山活动, 这个时期的大地构造环境才应归属为滨太平洋构造域。是什么意思？

Therefore, the the Daxinganling northern crust thinning mechanism, the Early Cretaceous - Eocene in western China crustal thickening in the extrusion mechanism of the formation of the Qinghai-Tibet Plateau, eastern China, crustal thinning in extensional environment, the formation of large-scale (in)

daxinganling is the thin crust of northern mechanism is the oldest Cretaceous shelf - Eocene squeeze in western China under a thick crust, Qinghai-Tibet plateau in the East China extend environment in the earth's crust, forming a mass (in acid-base of volcanic activity in that period of the tectonic

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Crustal thinning mechanism is in the Northern da hinggan mountains, early Cretaceous-Eocene extrusion formation mechanism of crustal thickening in Qinghai-Tibet plateau in Western China, and Eastern China crustal thinning in the extended environment, form a mass () of acid-base in volcanic activity,

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