Abstract
摘要：本計畫將針對西藏-喜馬拉雅和高加索-伊朗這兩個當今地球上最重要的碰撞造山帶進行對比研究，主要利用岩漿活動紀錄，深入探討碰撞造山作用在不同階段演化的過程。基於申請人過去十年左右對青藏高原及鄰區岩漿活動的研究心得，加上近兩年多來在高加索-伊朗地區所推展的前期工作，本計畫若能獲得充分補助而對此兩大造山帶首次進行有系統的對比分析，特別是針對後者選定主要亮點加強推動深化研究，預期可對大陸碰撞前、後的岩漿成因、碰撞過程中岩石圈結構的轉變、地體構造的時空演化、乃至巨型山脈高原隆升等大陸動力學的重大基本議題提供新的制約和解釋，具體促進台灣在國際地球科學相關研究領域的能見度和影響力。
Abstract: This project is proposed for conducting a comparative study, based specifically on magmatic viewpoint, of the Tibet/Himalaya and Caucasus/Iran orogens, two most important collision zones that take place in East and West Asia, respectively, in the Alpine-Zagros-Himalayan mountain range or so-called Tethyan orogenic belt, i.e., the largest mountain range in the world extending from the Atlantic to Pacific Oceans. This study aims at a more comprehensive understanding of the magmatic and tectonic evolution in continent-continent collision, with the Tibet/Himalaya exemplifying a well-established or mature stage of collisional orogen and the Caucasus/Iran an initial to intermediate stage, to depict the whole spectrum of geodynamic processes through which collisional orogeny evolves. Based on our successful experiences from the Tibet/Himalaya region performed in the past 10+ years and most recent results from the Caucasus/Iran belt obtained by the ongoing Silk Road Project, this newly proposed project has two main prospects, one is to maintain our leading position in the study of tectonomagmatic evolution in the Tibet/Himalaya orogen and neighboring regions, and the other is to create the competitive edge in the Caucasus/Iran belt by performing furthermore detailed work in specific areas. Regarding the latter, this project will focus on carrying out advanced studies of (1) the unusual occurrence of widespread post-mid-Miocene (≤11 Ma) igneous activity in the Caucasus/Iran/Anatolia (“CIA”) zone, a domain of active contraction owing to the Arabia-Eurasia collision, (2) the temporal and spatial evolution of the Urumieh Dokhtar Magmatic Arc, which extends from Armenia to the entire Iran, resulting from the Neotethyan subduction that was prevailing in the region before the collision began, and (3) the nascent volcanism in Bazman and Taftan areas, SE Iran related possibly to the active Makran subduction that may have initiated after the closure of
the Neotethys. It is emphasized that the key targets involve several fundamental problems in continental dynamics and plate tectonics, and that the proposed project presents a rare opportunity for the geosciences community in Taiwan to lead the research in an important frontier where keen international competition is yet to fully develop.
Keyword(s)
碰撞造山帶
西藏-喜馬拉雅
高加索-伊朗
岩漿活動
大陸動力學
Collisional orogeny
Tibet/Himalaya
Caucasus/Iran
Magmatism
Continental dynamics
