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- 40Ar/39 Geochronology of Volcanic and Intrusive Rocks in the Dabie and Sulu Terranes, Eastern China, and Their Tectonic Implications
- Thermochronological Study of the Dabie Shan Ultrahigh-Pressure Metamorphic Terrane, East Central China
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- Role of the Nanjih Fault on the Exhumation of the Pingtan-Dongshan Metamorphic Belt, Se China
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- Contrasting Cooling Rates of Coeval Granitic Plutons in the Zhangzhou Igneous Complex, SE China: Evidences from 40Ar/39Ar Thermochronology and Al-Amphibole Geobarometer
- 40Ar/39Ar Dating of High-Pressure Rocks in the Tananao Basement Complex, Taiwan
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題 名 | 40Ar/39 Geochronology of Volcanic and Intrusive Rocks in the Dabie and Sulu Terranes, Eastern China, and Their Tectonic Implications=中國東部大別山、蘇魯地區火山岩與侵入岩之定年學研究及其大地構造意義 |
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作 者 | 劉瑩三; 羅清華; 蔡金河; 鍾孫霖; 邱檢生; 李獻華; | 書刊名 | 中國地質學會會刊 |
卷 期 | 42:4 1999.11[民88.11] |
頁 次 | 頁493-520 |
分類號 | 358.3 |
關鍵詞 | 定年學; 岩漿活動; 大別山; 郯廬斷裂; Geochronology; Magmatism; Dabie shan; Tan-lu fault; |
語 文 | 英文(English) |
中文摘要 | 大別山-蘇魯地區妥質岩帶中的火山岩及侵入岩以40Ar/39Ar定年所得的年代為∼ 148-100Ma, 顯示大別山造山帶於板塊碰撞縫合後,在晚侏儸紀至晚白堊紀時期,發生廣泛 的岩漿活動;同時由郯廬斷裂帶附近拉張盆地中火成岩所得的年代為∼ 136-110Ma,指示郯廬斷裂在白堊紀早期為重要的活動時期。地球化學資料顯示此一地區的火山岩均具有鹼長基玄武岩及雙峰模式的性質,同時具有輕稀土元素富集與 Nb、Ta 及 Ti 負異常的現象,指示著板塊地函因部份融熔形成岩漿時,具有地殼物質混染的作用,這些地球化學特性十分類似後造山時期在張裂環境下所生成的岩漿岩石,其形成可能導因於「板塊去層作用」或是「增 厚板塊地函的移除作用」抑或是「造山塌陷的板塊脫層作用」。 由於大別山 - 蘇魯地區後造山時期的岩漿活動與造山帶最後一期剝蝕抬升作用同時發生,因此推論在侏儸紀至白堊紀時因岩漿活動所形成的張裂環境, 對於大別山 - 蘇魯地區超高壓變質岩由中地殼出露至地表,扮演著重要的角色。 |
英文摘要 | New 40Ar/39Ar geochronological data provide time constraints on post- collisional magmatism in the Dabie-Sulu orogenic belt, spanning from 148 Ma to 100 Ma (Jurassic-Cretaceous), and on the movement of the Tan-Lu fault during the Cretaceous (136-110 Ma). Geochemical data reveal that these igneous rocks are shoshonitic (high-potassium) and bi-modal (felsic-mafic) in nature, with characteristic features of light rare earth element enrichment and negative Nb, Ta, and Ti anomalies in the spidergrams, which indicate possible contamination from the lithosphere mantle underneath. These geochemical features are quite similar to those of "post-orogenic" magmatic rocks in an extensional tectonicregime, resulted from partial melting of the lithosphere due to "lithospberic delamination", "removal of thickened lithospheric mantle" or "slab breakoff" during mountain collapse. Since these post-orogenic magmatism appears to occur simultaneously with the final-stage exhumation of the Dabie orogen, it is thus propose that the Jurassic-Cretaceous extensional tectonism in the Dabieand Sulu terranes may have played an important role in causingthe exhumation of the ultrahigh-pressure (VHP) metamorphic rocks from the middle crustal depths to the surface. |
本系統中英文摘要資訊取自各篇刊載內容。