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第五章 結論

由顯微構造分析紅河剪切帶在點蒼山變質帶之岩體,結果顯 示此地區變質岩體中含有四期葉理互相疊置;兩兩葉理交軸出三 組葉理交軸,此三期葉理交軸反應點蒼山變質帶經歷三期塑性變 形期,且三組葉理交軸分別垂直塑性變形期的擠壓應力方向。有 鑑於紅河剪切帶自中生代以來經歷三次重大塑性變形事件-三疊 紀印支期、始新世到中新世左移期、與中新世之後的右移期,與 本研究所得的三期塑性變形之葉理交軸相對應,配合各期所形成 之剪切面、早期葉理被剪動的方向、及野外調查的結果,可知紅 河剪切帶主要三期塑性變形的葉理交軸由南-北向轉為西北-東

南向:第一期塑性變形發生於印支期,其主要應力方向(σ1)為東

-西向,形成垂直褶皺產生右旋的葉理;第二期塑性變形為紅河

剪切帶左移期,主要應力方向(σ1)為鉛直方向擠壓伴隨東-西方

向水平擠壓力,形成水平褶皺,並產生近水平之葉理,可知左移 時期沿水平剪切面剪切,並非 Leloup 等人(1995)所提出之切穿整 層岩石圈之左移剪切活動;第三期塑性變形為右移時期,主要應

力方向(σ1)為東北-西南向水平擠壓,產生垂直褶皺。

根據葉孟宛等人(2007)以 FIA 研究方探討紅河剪切帶三大變 質岩體(點蒼山、哀牢山、象背山)之應力史,顯示在印支期及左

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移期,紅河剪切帶三大變質岩體之主要應力方向皆為東-西向,

而在右移期,於紅河剪切帶西北端的點蒼山和哀牢山變質岩體應 力方向轉為東北-西南向,東南端的象背山之主要應力方向仍保 持東-西向。顯示紅河剪切帶右移時期,其應力場有區域上的不 同,此異同性可能為區域地殼經喜馬拉雅山東構造結順時針旋轉 而造成紅河剪切帶西北段與東南段的應立場的不一致。

紅河剪切帶左移活動在水平剪切面上,由礦物拉張線統計型 態大致呈同心圓狀,顯示點蒼山變質帶的剪動機制為上部地殼與 下部地殼耦合 (couple)。

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