کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9522235 1348287 2005 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Absence of extraterrestrial 3He in Permian-Triassic age sedimentary rocks
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
Absence of extraterrestrial 3He in Permian-Triassic age sedimentary rocks
چکیده انگلیسی
While no extraterrestrial 3He was detected at Opal Creek, there is a sharp increase in nucleogenic 3He very close to or at the Permian-Triassic boundary. This presumably arises from the major lithologic change at this time, from cherts in the Permian to shales and siltstones in the Triassic. Increased nucleogenic 3He is associated with increases in both lithium and organic carbon content into the Triassic. Either the production rate or the retention of this 3He is higher in the shales and siltstones than in the cherts. Care must be taken to eliminate such artifacts before interpreting changes in 3He concentration in terms of fluctuations in the delivery of 3He from space.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 240, Issue 2, 1 December 2005, Pages 265-275
نویسندگان
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