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研究生:許琳
研究生(外文):Lin Hsu
論文名稱:中國秦嶺造山帶陡嶺群變質岩之礦物化學及岩象分析
論文名稱(外文):Mineral Chemistry and Petrography of Metamorphic Rocks in the Douling Group, Qinling Orogenic Belt, China
指導教授:蔡金河蔡金河引用關係
指導教授(外文):Chin-Ho Tsai
學位類別:碩士
校院名稱:國立花蓮教育大學
系所名稱:地球科學研究所
學門:自然科學學門
學類:地球科學學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:152
中文關鍵詞:秦嶺造山帶陡嶺群岩象學電氣石
外文關鍵詞:Qinling orogenic beltDouling Grouppetrographytourmaline
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摘要
本研究區域主要為中國大陸秦嶺造山帶的陡嶺群(南陽盆地西側)以及佛子嶺群(南陽盆地東側)。過去在秦嶺造山帶的研究以(超)高壓變質岩區為主,較少對本研究區域做探討。秦嶺造山帶中的大別造山帶與南陽盆地以西的東秦嶺造山帶從主要大地構造線、定年學與超高壓變質岩分佈情形可推論兩造山帶有相似性,但比較缺乏對非高壓岩石之岩象學與礦物化學方面做研究。因此本研究探討陡嶺群的岩石組成類型,依岩象觀察劃分變質作用階段,再推算其變質溫壓狀況,並研究佛子嶺群的標本來探討兩地岩層是否有連續性的關係,討論這些非(超)高壓變質岩在大別-(東)秦嶺造山帶中的地質意義。
陡嶺群的岩類以劉嶺逆掩斷層作分界,斷層以北主要為雲母矽質片岩,少量千枚岩與雲母綠泥石片岩。斷層以南主要為變質基性岩、花崗岩、混合岩及富含角閃石的岩石。比較佛子嶺群的雲母矽質片岩與陡嶺群的雲母綠泥石片岩,兩者礦物組成相似,其中綠簾石外型均有壓縮與拉張的變形,化學成份大致相同(Ps值約0.2),且核部都有褐簾石存在。就岩象與礦物化學分析結果,陡嶺群的劉嶺逆掩斷層北部部分岩石與佛子嶺群的岩性相似。而兩岩層的變質碎屑岩均有電氣石的存在,陡嶺群的電氣石有變質結晶附生於碎屑殘晶之上的現象,另外也有原生變質電氣石。佛子嶺群的電氣石僅有變質結晶附生的現象。而陡嶺群與佛子嶺群碎屑電氣石的化學成分不同。
南陽盆地西側的研究區域,北邊的變質碎屑岩利用黑雲母溫度計計算的變質溫度平均約606 ± 8°C,壓力無法估算,組成礦物為黑雲母、白雲母、綠泥石等變質度低的礦物,其可能約在主要為綠片岩相至綠簾角閃岩相;往南的岩石,變質溫壓計算結果平均約數據為5.9 ± 0.3 Kbar,633 ± 6°C,變質度約在角閃岩相。
Abstract
This study focuses on the field-based petrology, petrography, and mineral chemistry of some metamorphic rocks from the Douling Group of the Qinling orogenic belt and the Foziling Group of the Dabie orogenic belt, central-eastern China. The Qinling and Dabie orogenic belts appear to be quite similar and coherent in terms of structural continuity and petrologic features. Nevertheless, due to lack of petrological documentation, the regional framework remains unclear. Previous studies in this region mostly focused on the ultrahigh-pressure (UHP) metamorphic units, and those non-UHP units, like the current study units, have not been investigated.
The litho-type of the Douling Group is subdivided into the northern and southern parts, with the Liuling fault as a structural boundary. Rocks in the northern part are mainly mica schist, phyllite, and mica-chlorite schist; whereas those in the southern unit are metabasite, granite, migmatite, and diorite. The studied samples from the Foziling Group are limited to mica schist only. Both the Douling Group’s and Foziling Group’s mica schists contain similar mineral assemblages. In particular, both rocks contain epidotes with similar textures, e.g. stretching and boudinage, with allanite relics or inclusions in the core. The Ps numbers of both epidotes are also almost same (about 0.2). On the other hand, metasedimentary rocks from both units contain tourmaline. The tourmalines in the Douling rocks generally show detrital cores and metamorphic overgrowth rims. Mineral compositions of detrital cores of the tourmalines from both groups are different.
Estimation of metamorphic temperatures and pressures of the studied rocks have been carried out with geothermobarometry applying to biotite, amphibole, and plagioclase. The calculated (average) temperature for the rocks in the northern part of Douling is about 606 ± 8 ºC, but pressure cannot be estimated. But the mineral assemblages imply greenschist- to epidote-amphibolite-facies conditions. The calculated (average) pressure and temperature for the rocks in the southern part are about 5.9 ± 0.3 Kbar and 633 ± 6 ºC respectively.
目 錄
中文摘要 Ⅰ
英文摘要 Ⅱ
目錄 Ⅲ
表目錄 Ⅳ
圖目錄 Ⅴ
常用礦物名稱縮寫 Ⅹ
第一章、緒論 1
1.1 前言 1
1.2 區域地質背景 4
1.3 研究流程 5
1.4 採樣地點與野外描述 9
第二章、岩象觀察 15
2.1 陡嶺群 15
2.2 「北淮陽變質帶」之佛子嶺群 52
第三章、礦物化學成分分析 60
3.1 長石類 61
3.2 黑雲母 70
3.3 白雲母 80
3.4 角閃石 90
3.5 綠泥石 103
3.6 簾石類 111
3.7 電氣石 121
第四章、變質溫度壓力估算 133
4.1 選用的地質溫壓計與其原理 133
4.2 地質溫度計計算結果 135
4.3 地質壓力計計算結果 137
第五章、討論 138
第六章、結論 144
第七章、引用文獻 146
誌謝 152
第七章 引用文獻
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