کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8868615 1622106 2017 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Volatile earliest Triassic sulfur cycle: A consequence of persistent low seawater sulfate concentrations and a high sulfur cycle turnover rate?
ترجمه فارسی عنوان
اولین سیکل سولفید تریاس نوین ناشی از کاهش غلظت پایدار سولفات روی آب و یک نرخ چرخه سولفور بالا چیست؟
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی
The MSR-trend transfer function yielded estimates of seawater sulfate of 0.6-2.8 mM for the latest Permian to earliest Triassic, suggesting a balanced oceanic S-cycle with equal S inputs and outputs and no major changes in sulfate concentrations during this interval. However, a secular trend toward heavier δ34SCAS (by > 5‰) in the earliest Triassic can be explained only by increasing the turnover rate of the S-cycle (by ca. one order of magnitude) and a concomitant change in terrestrial S sources in a box model experiment. Exposure of evaporite deposits having a high δ34S may account for the source change, with a possible role for the Siberian Traps volcanism by magmatic remobilization of Cambrian rock salt. A high sulfur cycle turnover rate would have left the ocean system vulnerable to development of widespread euxinic conditions, posing a sustained threat to marine life during the Early Triassic.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology - Volume 486, 15 November 2017, Pages 74-85
نویسندگان
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