The Pattern of Clay Mineral Tansformation and Palaeo-temperature in North Jiangsu Basin
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摘要: 以苏北盆地为例,系统研究了火成岩发育区粘土矿物组合特征及其控制因素;建立了粘土矿物转化模式;根据粘土矿物成岩演化特点,进行古地温分析。研究表明,苏北地区粘土矿物的分布主要受埋藏成岩作用、岩浆侵入、母质来源三种因素的影响,发育四种类型的粘土矿物组合和三种粘土矿物转化模式;火山碎屑岩母岩区和基性岩浆侵入区具有特殊的粘土矿物组合和成岩演化模式,前者以富含蒙皂石矿物为特点;后者出现高岭石与伊/蒙有序间层矿物共生组合,并具有不连续的演化序列;苏北盆地短有序I/S矿物出现于镜质组反射率 0.5 %～ 0.5 5 %的深度,伊/蒙间层矿物转变成伊利石在镜质组反射率 0.75 %～ 0.8%,可以用于热成熟度和古地温的估算;而蒙皂石消失的界面则不具有指标意义Abstract: Taking North Jiangsu basin as an example, this paperdemonstratesthe characteristicsof clay minerals assemblagesand the controlling factors in igneous regionssystemically, establishes the patterns of diagenetic transformation, analysespalaeo temperature according to the evolutionary features of the clay minerals. The distribution of clay minerals ismainly influenced by burial diagenesis, magma intrusion, volcanic clastic rocksandthere are fourtypes of clay mineral assemblages in North Jiangsu basin. The clay mineral assemblagesof smectite randomI/S and randomI/S illiteoccurin early diagenetic stagewith a vitrinite reflectance value of less than 0.55%, the assemblageof illite ordered I/S occursin middle diagenetic stagewith a vitrinite reflectance value of more than 0.55%,the assemblageof kaoliniteordered I/Soccursin middle and late diagenetic stage with a vitrinite reflectance value of more than 1.0%. There are special clay minerals assemblagesand diagenetic evolution models in regions of volcanic clastic rocks and magma intrusion. As the present of volcanogenic detrital materialregions, the assemblage of smectite randomI/S occurs repeatedly in vertical with the content of smectite of more than 90% in Fu'an region of Hai'an depression. Its evolution model is the assemblages from smectite randomI/S, to randomI/S illite, to Smectite randomI/S, to randomI/S illite, and illite ordered I/S. Gaoyou depression,being a represenative of magma intrusion regions, has a discontinuous evoluting sequence of the assemblages from smectite randomI/S,to randomI/S-illite, and kaolinite-ordered I/S, where kaoliniteand ordered I/S are observed coexisting. The evolution model of clay mineral in other regions is the assemblages from smectite randomI/S,to randomI/S illite, to illite ordered I/S. Short distance ordered I/S occurs at a vitrinite reflectance value of 0.5%～0.55%, the transformation from ordered I/Sto illite occurs at 3 280～3 390m in depth and 137 o C in temperature. The transforming surface can be used to estimate maturityand palaeo temperature while the disappearing surface of smectite can not be thermal indicator.
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Key words:
- clay mineral /
- diagenetic evolution /
- magma intrusion /
- parent materials /
- paleo temperature /
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