本文選題：揚(yáng)子西緣　切入點(diǎn)：新元古代冰川　出處：《中國地質(zhì)大學(xué)(北京)》2016年博士論文

【摘要】：華南揚(yáng)子古大陸存在兩期新元古代全球性冰川和一期間冰期記錄,依次為江口冰期(Sturtian)(ca.715-660Ma)、富祿間冰期(ca.660M-651Ma)和南沱冰期(Marinoan)(ca.651-635Ma)。揚(yáng)子西緣康滇地區(qū)自1940年發(fā)現(xiàn)新元古代冰川記錄以來一直與南沱冰期沉積南沱組相對比,因而認(rèn)為缺失江口冰期和富祿間冰期記錄。本文采用鋯石U-Pb定年手段,對揚(yáng)子西緣冰川啟動時(shí)間與期次進(jìn)行了制約。結(jié)果表明,揚(yáng)子西緣新元古代冰川啟動時(shí)間約為715Ma,與華南揚(yáng)子古大陸江口冰期乃至國際上Sturtian冰期啟動時(shí)間一致,存在江口冰期沉積記錄。沉積特征與旋回對比分析表明,揚(yáng)子西緣新元古代冰川沉積地層“南沱組”和列古六組下段可與江口冰期的江口群和長安組相對比,而“南沱組”和列古六組上段則可與間冰期富祿組、大塘坡組相對比。新的地層劃分對比方案改變了近一個(gè)世紀(jì)以來形成的傳統(tǒng)認(rèn)識,對華南揚(yáng)子古大陸重建具有深遠(yuǎn)的意義。“構(gòu)造-巖相古地理圖”是古大陸再造研究成果的載體和最理想的表達(dá)形式。本文在廣泛收集、分析前人實(shí)測剖面的基礎(chǔ)上,系統(tǒng)觀察、研究了揚(yáng)子西緣新元古代冰期、間冰期沉積特征和時(shí)空分布,參照現(xiàn)代大陸冰川沉積模式,引進(jìn)了大陸冰蓋、雪線、陸相冰緣、海相冰緣等地理學(xué)概念,建立了相應(yīng)的構(gòu)造模型和充填模式,編制了揚(yáng)子西緣新元古代冰期、間冰期構(gòu)造-巖相古地理圖,重建了當(dāng)時(shí)的構(gòu)造-古地理演化史。本文的構(gòu)造-巖相古地理演化研究成果對華南揚(yáng)子古大陸構(gòu)造-古地理演化和成礦背景研究具有重要的科學(xué)價(jià)值。
[Abstract]:There are two Neoproterozoic global glaciers and one interglacial record in the Yangtze ancient continent in South China. The order of order is Sturtianzao (715-660 Ma), Fulu interglacial (660M-651MaA) and Nantuo glacial (Marinoanzao. 651-635 Ma1). Since the discovery of the records of Neoproterozoic glaciers in Kangdian area, the western margin of Yangtze River, it has been contrasted with the Nantuo formation in the Nantuo glacial epoch since 1940, when the records of Neoproterozoic glaciers were discovered in Kangdian area. In this paper, zircon U-Pb dating method is used to restrict the onset time and duration of glaciers in the western margin of Yangtze River. The initiation time of Neoproterozoic glacier in the western margin of Yangtze is about 715Ma. it is consistent with the initiation time of Jiangkou glacial period and Sturtian glacial epoch in south China, and there are sedimentary records in Jiangkou glacial epoch. The lower member of Neoproterozoic glacial sedimentary strata "Nantuo formation" and Liegu formation can be compared with Jiangkou Group and Changan formation of Jiangkou glacial epoch, while "Nantuo formation" and upper member of Liegu formation can be compared with interglacial Fulu formation. Datangpo formation correlation. The new stratigraphic division and correlation scheme has changed the traditional understanding formed in the past century. The tectonic-lithofacies paleogeographic map is the carrier and the most ideal expression form of the paleocontinent reengineering research. Based on the extensive collection and analysis of the previous measured profiles, this paper makes a systematic observation. The sedimentary characteristics and temporal and spatial distribution of Neoproterozoic and interglacial epoch in the western margin of Yangtze were studied. The concepts of continental ice sheet, snow line, continental ice margin and marine ice margin were introduced according to the modern continental glacial deposition model. The corresponding structural model and filling model were established and the Neoproterozoic glacial and interglacial tectonic-lithofacies paleogeography maps of the western margin of Yangtze were compiled. The research results of tectonic-lithofacies paleogeography evolution are of great scientific value to the study of tectonic-paleogeographic evolution and metallogenic background in Yangtze, South China.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：P531;P534.3

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