本文選題：巖石學(xué) + 微區(qū)同位素��； 參考：《石油與天然氣地質(zhì)》2017年04期

【摘要】：四川盆地?zé)粲敖M中的"皮殼、櫛殼及葡萄狀"白云石是一種非常特殊結(jié)構(gòu)白云石。對四川盆地?zé)粲敖M葡萄-皮殼狀及基巖巖石學(xué)、碳氧與鍶同位素等研究表明:皮殼-葡萄狀白云石早期由內(nèi)纖狀(AC)、外為束狀-放射狀海底纖柱狀(RFC)的文石及犬牙狀高鎂方解石或粒狀方解石構(gòu)成。不同尺度"球狀-啞鈴"或菱形的泥微晶白云石沿C軸呈臺階式相向生長,反映了海水潛流帶為主的生長模式。微區(qū)同位素揭示了環(huán)帶中的粉細(xì)晶白云石要比黑、白相間纖狀白云石中的δ~(13)C,δ~(18)O負(fù)偏明顯;黑色纖狀又較白色纖狀白云石δ~(13)C,δ~(18)O正偏。環(huán)帶至少有3種變化情形:(1)δ~(18)O(PDB),δ~(13)C(PDB)負(fù)偏,87Sr/86Sr較高,較寬的明、暗陰極條帶,指示了周期性弱氧化與弱還原環(huán)境的變化海水并疊加了大氣淡水作用;(2)有序度變化大,從環(huán)帶核部至邊緣,δ~(13)C(PDB)緩慢下降,δ~(18)O(PDB)緩慢升高,87Sr/86Sr接近同時代的海水平均值,核部中等橙紅向外為不發(fā)光-暗淡發(fā)光,反映了核部弱還原向外變?yōu)槿跹趸�、海水并有持續(xù)大氣淡水的補給;(3)有序度較低、從環(huán)帶核部至邊緣,δ~(13)C(PDB)緩慢上升,δ~(18)O(PDB)先升后降,邊緣稍為偏負(fù),中等橙紅色、間隔有相對暗淡陰極發(fā)光,推測為停滯濃縮海水為主、后有弱氧化大氣淡水補給。據(jù)此推斷,皮殼-葡萄狀白云石是在新元古南華紀(jì)冰期的特殊海水背景下,經(jīng)歷了過飽和海水中微生物中細(xì)菌參于下成核、準(zhǔn)穩(wěn)態(tài)含鎂礦物沉淀(AC-RFC)、大氣淡水下水巖作用粒狀方解石(RFC-PC)和濃縮海水中的準(zhǔn)同生云化作用過程。
[Abstract]:The dolomite of the Dengying formation in Sichuan Basin is a very special structure dolomite.The petrology of Grape crust and bedrock of Dengying formation in Sichuan Basin,Carbon-oxygen and strontium isotopic studies show that early crustacean-grape dolomite was composed of internal fibrous actinite and bunchy-radial submarine fibrous columnar RFC) and canine dentate high magnesium calcite or granular calcite.Different scales of "globular dumbbell" or rhombohedral mud-microcrystalline dolomite growth along the C-axis of the pedestal phase, reflecting the sea water subcurrent zone dominated growth pattern.The microregional isotopes reveal that the fine crystalline dolomite in the annular zone is more negative than that in the black, white interphase fibrous dolomite has a negative bias of 13C, 未 ~ (18) O, and the black fiber shape is more positive than that of the white fibrous dolomite 未 ~ (13) ~ (13) C, 未 ~ (18) O.There are at least three variations in the ring zone: 1) 未 ~ (18) O ~ (+) PDBs, 未 ~ (13) C ~ (+) C ~ (DBB)) with a higher negative bias of 87s ~ (86) Sr and a wide strip of bright and dark cathode, indicating the variation of the environment of periodic weak oxidation and weak reduction of seawater and superposing the effect of fresh water in the atmosphere (2) the degree of order varies greatly.From the core of the ring band to the edge, the 未 ~ (13) C ~ (PDBs) decrease slowly, and the 未 ~ (18) O ~ (6 +) increase slowly. The 87s ~ (87) Sr ~ (86) Sr is close to the average value of the sea water of the same time. The medium orange red of the nucleus is non-luminescent and dim, which indicates that the weak reduction of the nuclear region becomes weak oxidation.The order of sea water is low, from the core of the annular zone to the edge, 未 ~ (13) C ~ (C ~ (+)) PDBs rise slowly, and then rise and then decrease, the edge is slightly negative, medium orange red, and the interval is relatively dim and cathodoluminescence, so it is assumed that the concentration of seawater is mainly stagnant and concentrated.Then there is a weak oxidation of fresh water recharge of the atmosphere.It is inferred that the crust-grape dolomite was formed under the background of the special sea water during the Neoproterozoic Southern China glacial period, and the bacteria in the supersaturated seawater were involved in the formation of the bacteria.Quasi-steady precipitation of magnesium-bearing minerals (AC-RFCU), granular calcite (RFC-PC) from freshwater water in the atmosphere and quasi-synchronal clouding processes in concentrated seawater.
【作者單位】： 中國石化石油勘探開發(fā)研究院無錫石油地質(zhì)研究所;中國石化石油勘探開發(fā)研究院;中國石化西南油氣分公司石油勘探開發(fā)研究院;中國石化江蘇油田分公司采油二廠;
【基金】：國家自然科學(xué)基金聯(lián)合基金項目(U1663209) 國家重點基礎(chǔ)研究發(fā)展計劃(973計劃)項目(2012CB214802) 國家科技重大專項(2011ZX05005-0023,2011ZX05008-003-11)
【分類號】：P588.245;P618.13

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