本文選題：軟沉積物變形構(gòu)造 + 風(fēng)暴作用��； 參考：《沉積學(xué)報(bào)》2017年02期

【摘要】：地質(zhì)歷史時(shí)期軟沉積物變形構(gòu)造在不同時(shí)空沉積巖中均有分布,然而學(xué)術(shù)界對(duì)其變形過(guò)程、作用力及觸發(fā)機(jī)制等仍存在許多爭(zhēng)議。通過(guò)對(duì)米倉(cāng)山前緣野外露頭觀測(cè),早志留世砂巖、粉砂巖、頁(yè)巖地層中,發(fā)育有多套軟沉積物變形構(gòu)造,其層位分布穩(wěn)定,但不同層位的形態(tài)特征差異較大,包括波浪狀變形層構(gòu)造、包卷層理、枕狀(橢球狀)構(gòu)造、火焰構(gòu)造等,多與丘狀交錯(cuò)層理相伴生,可分為三種組合類(lèi)型,均發(fā)育于中陸棚沉積環(huán)境中。基于該區(qū)軟沉積物變形構(gòu)造特征,結(jié)合碳同位素分析、古氣候、古板塊資料,并與現(xiàn)代颶風(fēng)研究成果對(duì)比,認(rèn)為研究區(qū)早志留世時(shí)大體上處于風(fēng)暴頻繁的炎熱環(huán)境,區(qū)內(nèi)軟沉積物變形構(gòu)造多為風(fēng)暴作用的結(jié)果,較強(qiáng)的風(fēng)暴觸及海底,使未固結(jié)成巖的沉積物的孔隙壓力增加,切變強(qiáng)度降低,使之液化,進(jìn)而發(fā)生變形。米倉(cāng)山前緣早志留世軟沉積物變形構(gòu)造的發(fā)現(xiàn)及其觸發(fā)機(jī)制的探討對(duì)區(qū)內(nèi)古地理、古氣候的恢復(fù),以及古揚(yáng)子板塊的演化具有重要的意義。
[Abstract]:In geological history, the deformation structures of soft sediments are distributed in different space-time sedimentary rocks. However, there are still many controversies in academic circles about their deformation process, force and trigger mechanism. Through field outcrop observation on the front edge of Micang Mountain, it is found that there are many sets of soft sediment deformation structures developed in early Silurian sandstone, siltstone and shale strata, and their horizon distribution is stable, but the morphological characteristics of different strata are quite different. It includes wavy deformed layer structure, encrusted bedding, pillow (ellipsoid) structure, flame structure and so on, which are associated with mound interlaced bedding, and can be divided into three kinds of assemblage types, all of which are developed in the middle shelf sedimentary environment. Based on the structural characteristics of soft sediment deformation, combined with carbon isotope analysis, paleoclimate and paleo-plate data, and compared with the results of modern hurricane research, it is considered that the early Silurian period in the study area was generally in a hot environment with frequent storms. The deformation structure of soft sediment in this area is mostly the result of storm action, and the stronger storm touches the seabed, which increases the pore pressure of unconsolidated diagenetic sediments, decreases the shear strength, and results in the liquefaction and deformation of the unconsolidated diagenetic sediments. The discovery of early Silurian soft sediment deformation structure and its triggering mechanism are of great significance to paleogeography, paleoclimate recovery and paleo-Yangtze plate evolution.
【作者單位】： 西南石油大學(xué)油氣藏地質(zhì)與開(kāi)發(fā)工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;西南石油大學(xué)地球科學(xué)與技術(shù)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41272135)~~
【分類(lèi)號(hào)】：P534.43;P512.2

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 席與華;蘇皖地區(qū)早志留世墳頭組腹足類(lèi)[J];古生物學(xué)報(bào);1997年02期

2 潘江;傅力浦;;陜南發(fā)現(xiàn)早志留世脊椎動(dòng)物化石[J];地球;1985年03期

3 王懌,歐陽(yáng)舒;貴州鳳岡早志留世孢子組合的發(fā)現(xiàn)及其古植物學(xué)意義[J];古生物學(xué)報(bào);1997年02期

4 周小康,張?jiān)聵?shù);陜西嵐皋地區(qū)早志留世滔河口組的厘定及其意義[J];陜西地質(zhì);1996年01期

5 羅金海;車(chē)自成;劉良;陳丹玲;曹遠(yuǎn)志;;西昆侖北帶早志留世構(gòu)造作用及其區(qū)域地質(zhì)意義[J];西北大學(xué)學(xué)報(bào)(自然科學(xué)版);2009年03期

6 于福生,王春英,漆家福,王濤;甘新交界紅柳河地區(qū)早志留世蛇綠混雜巖的厘定及大地構(gòu)造意義[J];礦物巖石;2000年04期

7 藍(lán)光志，張廷山，高衛(wèi)東;川西北地區(qū)早志留世瘤狀灰?guī)r的類(lèi)型、成因及意義[J];西南石油學(xué)院學(xué)報(bào);1994年03期

8 張廷山，蘭光志，陳曉慧，俞劍華，邊立曾;川西北早志留世陸源碎屑──碳酸鹽混積緩坡[J];沉積學(xué)報(bào);1995年04期

9 李軍,王懌;陜西寧強(qiáng)早志留世寧強(qiáng)組疑源類(lèi)[J];古生物學(xué)報(bào);1997年03期

10 李六全;陜西山陽(yáng)縣南寬坪地區(qū)首次發(fā)現(xiàn)早志留世筆石化石[J];陜西地質(zhì);1997年02期

，

本文編號(hào)：1829279