本文選題：喀斯特　切入點(diǎn)：卡尼期濕潤(rùn)氣候事件　出處：《沉積學(xué)報(bào)》2017年03期 　論文類型：期刊論文

【摘要】：在川西北地區(qū)綿竹漢旺、安縣雎水剖面上三疊統(tǒng)卡尼階海綿礁(丘)灰?guī)r頂部發(fā)現(xiàn)古喀斯特;野外露頭可見明顯的花斑狀構(gòu)造以及蜂窩狀溶孔,顯微鏡下可見泥晶化顆粒,喀斯特角礫以及喀斯特溶孔充填物,其中包括泥—亮晶方解石,生物碎屑以及陸源石英顆粒;根據(jù)露頭巖性和顯微薄片特征判斷其屬于早成巖期喀斯特;喀斯特成單層發(fā)育,之上覆蓋化石豐富的黃色或黑色頁(yè)巖,其中的菊石化石鑒定表明其為上卡尼階底部沉積。該喀斯特是重要的等時(shí)界面,且可作為該地區(qū)上下卡尼階的界線�？λ固刂系膸r性在漢旺和雎水有差異:在綿竹漢旺青巖溝剖面,喀斯特灰?guī)r之上覆蓋有黑色粉砂質(zhì)頁(yè)巖與生屑灰?guī)r(如層狀海綿灰?guī)r、海百合灰?guī)r),在漢旺觀音崖剖面,喀斯特面之上發(fā)育海綿丘灰?guī)r及頁(yè)巖,在安縣雎水剖面,古喀斯特發(fā)育在滾落的海綿巨礫之上。綜合研究表明,喀斯特的形成與早期龍門山的隆升以及卡尼期濕潤(rùn)氣候事件在發(fā)生時(shí)間上非常相近,推測(cè)其成因與龍門山的隆升以及卡尼期濕潤(rùn)氣候事件有關(guān)。
[Abstract]:Paleo karst was found on the top of the cavernous reef (mound) of Triassic in Hanwang Mianzhu, Anxianjushi section in northwestern Sichuan, and obvious blotchy structure and honeycomb dissolution pore were found in outcrop in the field, and mud-crystallized particles could be seen under microscope. Karst boulders and karst dissolved pore fillers, including mud-bright calcite, bioclastic and terrestrial quartz particles, which belong to the early diagenetic karst stage according to the characteristics of outcrop lithology and microslice, and karst monolayer development, It is covered with fossil rich yellow or black shale, in which the identification of permethrin fossils indicates that it is deposited at the bottom of the upper Carney stage. The karst is an important isochronous interface. The lithology over karst is different between Hanwang and Ju: in the Hanzhu Hanwang blue gully section, karst limestone is covered with black silty shale and bioclastic limestone (such as layered sponge limestone). The lily limestone developed on the Hanwang Guanyin Cliff section, the karst surface developed sponge mound limestone and shale, and the ancient karst developed on the rolling spongy boulder in Anxian Ju Shui section. The formation of karst is closely related to the uplift of the early Longmen Mountains and the humid climatic events of the Carney period, which is related to the uplift of the Longmen Mountains and the humid climate events of the Karni period.
【作者單位】： 成都理工大學(xué)沉積地質(zhì)研究院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41572085,41272131)~~
【分類號(hào)】：P534.51

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