High-frequency Cycles and High-resolution Sequence Stratigraphy of Ruyang Group, Mid-Proterozoic Era in Western Henan
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摘要: 豫西中元古界汝阳群可划分成6个3级层序(Sequence),这些层序又由若干高频层序（旋回）构成,其中第6层序（SQ6）包含了9个副层序组（四级旋回）、36个以上副层序（五级旋回）。副层序一般反映了向上变浅的沉积相序,顶底面均是一个突然变深的沉积间断面,并伴有明显的冲刷现象。副层序一般向上粒度变粗（砂岩）、层厚增大,详细的地球化学资料表明,在副层序中,随着沉积相序向上变浅,As、Se等微量元素含量降低,δ13C值则增大,副层序的这些特征可能与海平面波动引起的沉积环境变化有关。Abstract: Ruyang Group in the western Henan can be divided into six third-order sequences. These sequences are made of some high-frequency sequence. The sequence 6 in them contains 9 parasequences sets and more than 36 parasequence. A parasoquence consistsof various sedimentary facies having upward-shallowing sequence, and is bounded by hiatus. The grain size is upward-coarseningand bed is upward thicking in parasequence. Geochemical data show As, Sb decrease and &13C increase in upward-shallowing se-quence. The character of the parasequence has relationship with to the sea-level change.
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Key words:
- High-frequency cycle /
- sedimentary facie sequence /
- microelement /
- carbon isotope
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[1] 孙枢.豫陕中一晚元古生代沉积盆地(一).地质科学。1989,(4):314~3220 [2] 雷振宇.豫西中元古代汝阳群层序地层初步研究.地球科学，.1996,21(3):272-276. [3] 南京大学.地球化学，北京:科学出版社。1984,3210 [4] 宋天锐.广东曲江一仁化晚二叠世地层的沉积相和元素变化.岩石地球化学，1983,2(1);87-96. [5] 钟华.山西五台山地区早元古代白云岩碳同位素演化及意义.中国科学(B辑),1993,23(10):1099~1104. [6] Jackson M. J.,Facies and sequence stratigraphic analysis in an in-tracratonic, thermal-relaxation basin: the earth Proterozoic LowerQuilalar Formation and Ballara Quartzite, mount. Isa. AustraliaSedimentary. 1990, 37(6):1053-1078 -
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