【摘要】：西天山伊寧地塊的構(gòu)造格局及其演化之認(rèn)識(shí)久存爭(zhēng)議,倍受關(guān)注。分歧焦點(diǎn)有三:(1)石炭紀(jì)有無(wú)洋盆存在?(2)若有洋盆,何時(shí)閉合?(3)"溝-弧-盆"消亡時(shí)究竟是單向俯沖還是雙向俯沖?若是單向俯沖,俯沖方向是由北向南或是相反(即俯沖極性)?因此,這些重大地質(zhì)問(wèn)題均聚焦于本區(qū)的火山巖。石炭紀(jì)火山巖是伊寧地塊中的最主要建造和指示構(gòu)造演化的關(guān)鍵層位,爭(zhēng)論長(zhǎng)久而激烈。本文認(rèn)為,伊寧地塊早石炭世發(fā)育弧前-島弧-弧后盆地鈣堿性火山-沉積建造,是塔里木板塊北緣的主要組成部分;而晚石炭世堿性系列雙峰式火山巖及其沉積組合則是大陸裂谷火山-沉積建造,形成于區(qū)域性伸展構(gòu)造環(huán)境,是準(zhǔn)噶爾板塊與塔里木板塊縫合后的陸內(nèi)建造,因而古洋盆的關(guān)閉時(shí)限是早石炭世晚期(鄯善運(yùn)動(dòng))。依據(jù)區(qū)內(nèi)早石炭世建造的空間分布和變化規(guī)律,作者們認(rèn)為古天山洋盆與當(dāng)今地學(xué)界作為典型的日本溝-弧-盆體系有著極好的相似性和空間分布可對(duì)比性。石炭紀(jì)火山巖為本區(qū)的構(gòu)造演化研究提供了重要的約束信息。
[Abstract]:The understanding of the tectonic framework and evolution of the Yining block in the West Tianshan Mountains has been controversial for a long time, which has attracted much attention. There are three focal points of divergence: (1) is there an ocean basin in Carboniferous? (2) if there is an ocean basin, when it is closed? (3) when the trench-arc-basin dies, is it a one-way subduction or a two-way subduction? If it is a one-way subduction, is the direction of the subduction going from north to south or the opposite (that is, the polarity of the subduction)? Therefore, these major geological problems focus on volcanic rocks in this area. Carboniferous volcanic rocks are the most important strata of formation and indication of tectonic evolution in the Yining massif, which are controversial for a long time. In this paper, it is considered that the calc-alkaline volcanic-sedimentary formation of the early Carboniferous pre-arc-island-back-arc basin in the Yining block is the main component of the northern margin of the Tarim plate. The bimodal volcanic rocks of the late Carboniferous alkaline series and their sedimentary assemblages are continental rift volcanoes-sedimentary formations formed in the regional extensional tectonic environment, and are intracontinental formations after suture of the Junggar plate and the Tarim plate. Therefore, the closing time of the paleo-ocean basin is the late early Carboniferous (Shanshan movement). According to the spatial distribution and variation law of the early Carboniferous in the area, the authors believe that the ancient Tianshan ocean basin has excellent similarity and spatial distribution as a typical Japanese trench-arc-basin system. Carboniferous volcanic rocks provide important constraint information for the study of tectonic evolution in this area.
【作者單位】： 長(zhǎng)安大學(xué)地球科學(xué)與資源學(xué)院;國(guó)土資源部巖漿作用成礦與找礦重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41273033、41303027) 中央高�；痦�(xiàng)目(310827153407) 新疆維吾爾自治區(qū)地質(zhì)專項(xiàng)(Y15-1-LQ01)聯(lián)合資助
【分類號(hào)】：P588.14

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 袁峰,周濤發(fā),岳書倉(cāng);新疆諾爾特地區(qū)石炭紀(jì)火山巖的成巖機(jī)制[J];地質(zhì)地球化學(xué);2002年03期

2 王博;舒良樹(shù);Cluzel D;Faure M;Charvet J;馬前;;新疆伊犁北部石炭紀(jì)火山巖地球化學(xué)特征及其地質(zhì)意義[J];中國(guó)地質(zhì);2006年03期

3 黨r，

本文編號(hào)：2431260