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相關文獻
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頁籤選單縮合
題名 | Recent MT Surveying Supports the Thin-Skinned Structures in the Orogen=深部電探結果支持臺灣造山運動屬薄皮模型 |
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作者 | 陳洲生; | 書刊名 | 中國地質學會會刊 |
卷期 | 42:1 1999.02[民88.02] |
頁次 | 頁59-68 |
分類號 | 353.8 |
關鍵詞 | 薄皮模型; 大地電磁法; 電性構造; 脫水作用; Thin-skinned tectonics; MT; Electrical structures; Dehydration; |
語文 | 英文(English) |
中文摘要 | Suppe 從臺灣西部摺皺與逆衝帶之研究中發現臺灣造山運動, 影響地殼深度僅及 20 公里內,因而首先提出臺灣造山運動的薄皮模型,爾後的臺灣西部震測資料及油井資料 亦支持該薄皮理論。最近三年來臺灣地區之大地電磁法施測結束顯示地表下 20 公里深度內 之電性構造,可與臺灣地表南北向縱走之地質構造相對應; 而 20 公里下之電,性特徵,則 呈現分布均勻的低電阻帶,該低電阻帶之成因,從溫度推估,否定了高溫所致,而極可能屬 於相互連通之液相反應,此發現也提供了薄皮模型中 20 公里下存在滑脫面之證據。因此大 地電磁法探測結果,似乎肯定臺灣造山運動屬薄皮模型。 |
英文摘要 | Suppe pioneered the modeling of the Taiwan orogeny in terms of "thin-skinned" tectonics. His interpretation came primarily from mapping of the fold-and-thrust belt in western Taiwan, and was later supported by exploration seismics and some drilling data there. The magnetotelluric (MT) investigation was undertaken during the recent three years with more than 50 soundings uniformly covering the entire Island of Taiwan. It indicates that the resistivities variations observed are closely correlated to the change of the surface geology of Taiwan down, at best, to a shallow depth of the upper 20 km. Beneath this depth, there exists a regional zone of sharply-decreasing electrical resistivity which is probably caused by a structural zone with densely interconnected fluid phase. In other words, the recent Taiwan Orogeny has formed an evident decollement structure in which the upper zone above the depth of 20 km exhibits entirely independent structural style from the lower one. MT observations seem to support the model of thin-skinned Taiwan orogeny. |
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