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題名 | Metabentonites from Early Cambrian Meishucunian Stage in Eastern Yunnan, China and Their Implications=滇東早寒武世梅樹村期變斑脫岩及其地質意義 |
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作者 | 張俊明; 虞子冶; 朱茂炎; 李國祥; 周傳明; Zhang, Junming; Yu, Ziye; Zhu, Maoyan; Li, Guoxian; Zhou, Chuanming; |
期刊 | Bulletin of the National Museum of Natural Science |
出版日期 | 19971200 |
卷期 | 10 1997.12[民86.12] |
頁次 | 頁161-173 |
分類號 | 358.13 |
語文 | eng |
關鍵詞 | 變斑脫岩; 地球化學; 梅樹村期; 雲南東部; Metabentonites; Volcanic eruption event; Meishucunian stage; Eastern yunnan; |
中文摘要 | 滇東地區早寒武世梅樹村期地層中出現的十多層淺色粘土岩層為酸性火山灰蝕變形成的變斑脫岩,這些變斑脫岩的穩定微量元素 Hf、Nb、Y、Th、Zr、含量高於非火山成因的粘土岩,Fe、Mg、Ni、Co、Cr、Cu 含量低於節竹寺組泥岩,TiO /Al O、Zr/Hf、Ti/Th比值屬於酸性火山岩範圍,球粒隕石標準化稀土元素配分模式和具中至大的 Eu 負異常也類似於花崗岩稀土元素配分模式。變斑脫岩在地層序列上和區域上分布顯示了早寒武世梅樹村期火山活動頻繁,它們是火山噴發事件和高分辨事件地層對比的重要標誌。 |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。