关于甚低级变质作用与近变质带研究中的几个问题

On several research aspects of very low-grade metamorphism and anchzione

本文集中讨论了甚低级变质作用研究中涉及到的几个问题,包括:(1)近变质带的创立及其在解决划分成岩作用与变质作用界线这一国际难题中所取得的进步;(2)伊利石结晶度对碎屑岩甚低级变质作用研究起到的作用与贡献;(3)仪器校正、粒度大小及其与Kübler指数的经验关系式;(4)泥质碎屑岩中的成岩指示矿物与变质指示矿物;(5)松潘-甘孜、巴颜喀拉造山带的甚低级变质作用的模式与新的成因解释;(6)讨论了涉及到的科学研究的相关规则。提出了运用指示矿物结合伊利石结晶度划分成岩作用/变质作用界线的方案和建立喜马拉雅伊利石结晶度标样的重要性与必要性;提出碎屑岩甚低级变质作用的新成因模式。

Several aspects of very low-grade metamorphism were discussed in this article, including(1) Kübler’s creation of “anchizone” and its role in the solution of the boundary between diagenesis and metamorphism, which is an internationally-agreed puzzle in geology;(2) contribution and role of “illite crystallinity” in the research of very low-grade metamorphism of clastic rocks;(3) calibration of instrumental, and a proposed calibration formula between Kübler Index and domain size;(4) diagenetic and metamorphic index minerals;(5) new pattern and genetic interpretation for very low-grade metamorphism of Songpan-Garzê and Bayan Har orogens;(6) in addition, some scientific regulations were discussed. It is proposed that the boundary between diagenesis and metamorphism can be ascertained by a combination of index minerals with “illite crystallinity”. It is realized that to establish a set of standards of “illite crystallinity” from Himalaya is very important and essential. New interpretation of metamorphic pattern of Triassic flysches in the Tibet plateau could be used for genetic analysis of very low-grade metamorphism of clastic rocks beyond the only model burial metamorphism.