The Revolution of the Isotopic Composition of Strontium in the Permian Paleo-ocean in South China
-
Abstract: It is well known that the strontium isotope is very useful not only for studying sedimentary history of palaeo-ocean but also for stratigraphic classification. So it is very important to research the geochemistry of strontium isotope. The paper, taking the Mouyang profile in Guizhou for example and through the analyses of the isotopic composition in marine carbonate,discusses in detail the evolution of strontium isotope and its geological significance. The results show the following facts:1. In general, the change of the isotopic composition of strontium in marine carbonate is between 0. 70722 and 0. 70767 from the begining to the end of the Permian period. 2. The change scale of the strontium isotope is similar to the results determined by B. N.Popp; And its evolution trend is very similar to the outcome published by W. H. Burk and B.N. Popp.3. The change of isotopic composition of strontium is controlled by the source of strontium, such as volcanic rock, crust silicate and old marine carbonate. From the study area, it is known that the change of 87Sr/86Sr ratio is related to sea level change, and there is a negtive conrelation between the 87Sr/86Sr ratio and sea level change.
-
Key words:
- Permian period /
- Paleo-ocean /
- Strontium isotope
-
[1] 1.Veizer,J; R. Demovic, 1974, Strontium as a tool in facies analyses; J. Sediment. 44(1):99-115.
2.Veizer,J,1975, Possible use of strontium in sedimentary rocks as a paleo-environmental indicator; Sedimentary Ue-ology. 5 (1) : 5-22.
3.赵其渊,1988,海洋地球化学,地质出版社。
4.Pryrtmsn, Z. E.,1970, Isotopic composition of strontium in seawater throughout Phanerowic time; Geochim. Cos-mochim Acta. 34 (12 ) :105-121.
5.Brass, G. W.,1976, The variation of marine 87Sr/86Sr ratio during Phanerozoic time; Geochim. Cosmochim. Acta. 40(1):721-730.
6.Popp,B. N.,1986,87Sr/86Sr ratios in Pre-Carboniferous seawater from analyses of well-preserved brachiopod shells;Geochim. Cosmochim. Acta. ,50(7):1321-1328.
7.Burk, W. H.,1982, Variation of seawater 87Sr/86Sr throughout Phanerowic time; Geology. 10(10):516-519.
8.E. D. Goldberg, 1986, Minor elements in sea water. In: Riley, J. P.,Skirrow . (G. ( eds ):Chemical (keanograph:Vol. 1 New York: Academac Press.
9.G.福尔,1972,银同位素地质学(中译本),科学出版社。
10.Hess,J. ;M. L. Bender and J. Schilling, 1986, Evolution of the ratio of strontium-87 to strontium- 86 in sea water from Cretaceous to present; Science ,231(4741):979-983.
11.Chaudhuri,S. and N. Clauer, 1986, Fluctuations oI isotopic composition of strontium in seawater during the Phanero- zoic Eon; Chemical Geology. ,59(4):293-303. -

计量
- 文章访问数: 513
- HTML全文浏览量: 20
- PDF下载量: 369
- 被引次数: 0