本文選題：長興期 + 生物礁��； 參考：《沉積學報》2017年01期

【摘要】：晚二疊世長興期是華南地區(qū)重要的成礁期,也是火山事件頻發(fā)的一個時期。生物礁是一種對海洋環(huán)境十分敏感的生態(tài)系,晚二疊世的火山作用勢必影響到當時生物礁的生長和沉積相的演化。然而,前人有關晚二疊世火山事件的研究主要集中在二疊系與三疊系界線附近,而對整個長興期生物礁的演化與火山事件關系的研究則較少。選擇貴州紫云的臺地邊緣礁為研究對象,通過大量磁化率的測試,分析整個晚二疊世生物礁的沉積演化與火山作用的關系。分析結果顯示,長興早期和末期巖石的磁化率值明顯偏高,反映較強的火山活動。在這兩個時期,造架生物相對不發(fā)育。長興中期,巖石的磁化率值相較于長興早期和長興晚期總體偏低,表明火山活動相對較弱,導致生物礁的快速生長。但長興中期生物礁灰?guī)r中夾有幾層生物碎屑灰?guī)r,其磁化率值有小幅度的升高,說明短時期小規(guī)模的火山作用雖然導致了生物礁生長的暫時中斷,但礁相動蕩的環(huán)境使得火山灰中細小的鐵磁性物質難以沉積下來。研究發(fā)現(xiàn),盡管早三疊世早期泥巖具有高的磁化率值,但泥質巖中多層火山黏土具有異常高的磁化率值,火山灰物質對磁化率大小的影響遠遠超過陸源物質的貢獻。
[Abstract]:The Changxing period of late Permian is an important reefing period in South China, and it is also a time of frequent volcanic events. The reef is a very sensitive ecosystem to the marine environment. The volcanism of the late Permian will affect the growth of the reef and the evolution of the sedimentary facies at that time. However, previous studies on the late Permian volcanic events mainly focus on the Permian and Triassic boundary, but the relationship between the evolution of the whole Changxing reef and volcanic events is less. The platform marginal reef of Ziyun in Guizhou Province was selected as the research object. The relationship between the sedimentary evolution and volcanism of the entire late Permian reef was analyzed by a large number of magnetic susceptibility tests. The results show that the magnetic susceptibility of the early and late Changxing rocks is obviously higher, which reflects the strong volcanic activity. During these two periods, the scaffolding organisms were relatively undeveloped. In the middle period of Changxing, the magnetic susceptibility of rocks is lower than that of early and late Changxing, indicating that the volcanic activity is relatively weak, which leads to the rapid growth of reefs. However, there are several layers of bioclastic limestone in the reef limestone of the middle period of Changxing, and its magnetic susceptibility is increased by a small margin, which indicates that the small-scale volcanism caused the temporary interruption of the growth of the reef in a short period of time. But the turbulent reef environment makes it difficult to deposit the fine ferromagnetic material in the volcanic ash. It is found that although the early Triassic mudstone has a high magnetic susceptibility value, the multilayer volcanic clay in the mudstone has an unusually high magnetic susceptibility value, and the influence of volcanic ash on the magnetic susceptibility is far greater than that of the continental source material.
【作者單位】： 廣州海洋地質調查局;中國地質大學地質過程與礦產資源國家重點實驗室;湖北省地質調查院;
【基金】：國家自然科學基金項目(41572001)~~
【分類號】：P317;P512.2

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