以岩石熱歷史解析大陸碰撞造山作用：台灣山脈帶板岩地區熱變質記錄研究，及與東亞地區山脈帶對比初探;Continental Collision Kinematics Illuminated through Rock Thermal History: Thermal-Metamorphic Documentation in the Slate Terrain of the Taiwan Mountain Belt and Pilot Comparative Investigations in East Asia

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Title:	以岩石熱歷史解析大陸碰撞造山作用：台灣山脈帶板岩地區熱變質記錄研究，及與東亞地區山脈帶對比初探;Continental Collision Kinematics Illuminated through Rock Thermal History: Thermal-Metamorphic Documentation in the Slate Terrain of the Taiwan Mountain Belt and Pilot Comparative Investigations in East Asia
Authors:	陳致同
Contributors:	國立中央大學地球科學學系
Keywords:	台灣造山帶;板岩帶;變質峰值溫度;岩石溫壓演化路徑;變質年代;細緻化地質填圖;Taiwan orogenic belt;slate belt;peak metamorphic temperature;rock P-T-t-d history;metamorphic age;LiDAR-assisted geologic mapping
Date:	2020-01-13
Issue Date:	2020-01-13 14:22:40 (UTC+8)
Publisher:	科技部
Abstract:	碰撞造山作用中，海洋與大陸邊緣的沉積蓋層的岩石循環可關鍵性的約制造山帶的演化過程與構造。針對這些受到造山作用變質變形的變質沉積岩，量測其變質度以及變質變形的年代至關重要。新穎的碳質物拉曼光譜地質溫度計(RSCM)量測變質沉積岩中所夾碳質碎屑的石墨化程度推估該岩石之最高變質溫度，結合地層、構造、古地理等野外資料收集與量測及文獻整合，可重建其溫壓歷史，以及肇因之造山帶生長模式；在如此有良好熱歷史約制、並有較大顆粒同構造(含鉀)礦物生長的露頭與樣本，原位雷射氬氬定年分析則可將前述構造作用的發生時間及作用時間尺度解析，建立完整岩石溫壓變形歷史。本計畫立足台灣，於其主要組成部分之第三系蓋層板岩帶進行上述工作以深究活動造山帶的演育過程與機制，包括構造底部加積、底脫斷層的深度與幾何、與岩石掘升；於分析資料集中、重大構造通過地區，取得LiDAR高解析地形資料，綜合差異侵蝕特徵進行變質岩區高精度地質圖繪製先導研究。本計畫將應用RSCM及原位定年技術及於台灣所得成果應用於東亞大地構造，選定大型造山帶-青藏高原東緣，以及古老造山帶-越南西北部地區。規劃第一年進行實驗室建構與台灣北部地區板岩帶的熱歷史調查、樣本採集與分析，第二年則在台灣中部埔里以東地區進行，第三年集中於梨山斷層沿線，同時於東亞對比研究區開展調查分析。 ;Rock history of the sedimentary cover wrapping the subducted oceanic and continental margin basement is crucial to unravel the architecture and evolution of resultant orogenic belts. Among the key constraints for rock cycle of these meta-sediments are the degree and timing of metamorphism and associated deformation; they may be addressed by integrated application of the novel geothermometer RSCM (raman spectroscopy of carbonaceous material) recording the T-dependent graphitization of organic detritus, and in-situ laser microprobe 40Ar/39Ar dating of syn-kinematic mineral growths. Such comprehensive approach will be applied to the Tertiary slate of Taiwan to quantitatively resolve the growth mechanism and structural evolution of the current mountain building system, including vital and debated issues on detachment fault depths and geometry, significance of basal accretion, and rock exhumation processes; where meta-sediment rock cycles are well-established with sufficient field structural data, LiDAR-derived high-resolution topographic models may assist advanced detailed geologic mapping in areas of important structures. The techniques and knowledge from Taiwan orogen will be applied to major East Asia mountain belts, and pilot investigations are planned for a large active orogenic system – eastern margin of Tibetan Plateau, and an ancient orogen – the NW Vietnam region. 3 years of research work is devised: the first year on establishing the RSCM laboratory and on investigation in the northern part of the Taiwanese slate terrain; the second year the slate terrain in central Taiwan will be targeted; for the third year focus will be placed along the Lishan Fault; field and lab analyses in the East Asia pilot studies will be carried out in parallel.
Relation:	財團法人國家實驗研究院科技政策研究與資訊中心
Appears in Collections:	[Department of Earth Sciences ] Research Project

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