Paleoecology of Permo-Triassic Boundary According to Palynoflora in Shourjestan, Iran
نویسندگان
چکیده
منابع مشابه
Rapid eruption of the siberian traps flood basalts at the permo-triassic boundary.
The Siberian Traps represent one of the most voluminous flood basalt provinces on Earth. Laser-heating (40)Ar/(39)Ar data indicate that the bulk of these basalts was erupted over an extremely short time interval (900,000 +/- 800,000 years) beginning at about 248 million years ago at mean eruption rates of greater than 1.3 cubic kilometers per year. Such rates are consistent with a mantle plume ...
متن کاملThermobarometry and mineral chemistry of Central Iran Permo-Triassic lamprophyres in Chahrisseh Region, northeast Isfahan
Chahrisseh magmatic rocks are located in the northeast Isfahan, in the Sanandaj-Sirjan structural zone and parallel to the Qom-Zefre fault. These magmatic masses are located in a continuous section of Permian-Triassic sediments and rarely enter the Early Triassic beds. These rocks contain anhydrous ferromagnesium minerals (olivine, clinopyroxene and plagioclase), hydrous ferromagnesium minerals...
متن کاملExamination of hypotheses for the Permo-Triassic boundary extinction by carbon cycle modeling.
The biological extinction that occurred at the Permian-Triassic boundary represents the most extensive loss of species of any known event of the past 550 million years. There have been a wide variety of explanations offered for this extinction. In the present paper, a number of the more popular recent hypotheses are evaluated in terms of predictions that they make, or that they imply, concernin...
متن کاملDiagenetie processes and remagnetization in Permo- Triassic reb beds
Palaeomagnetic methods of analysis have largely been concentrated on distinguishing between the relatively hard and soft components which make up the natural remanent magnetization (NRM) of sedimentary rocks. Ihis has been because of the widespread beliefthat, in general, the hard cornponents are primary in origin whule the soft components are secondary, having been acquired a long time afler d...
متن کاملOcean acidification and the Permo-Triassic mass extinction.
Ocean acidification triggered by Siberian Trap volcanism was a possible kill mechanism for the Permo-Triassic Boundary mass extinction, but direct evidence for an acidification event is lacking. We present a high-resolution seawater pH record across this interval, using boron isotope data combined with a quantitative modeling approach. In the latest Permian, increased ocean alkalinity primed th...
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ژورنال
عنوان ژورنال: International Journal of Geography and Geology
سال: 2017
ISSN: 2306-9872,2305-7041
DOI: 10.18488/journal.10/2017.6.1/10.1.8.17