کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6427196 1634702 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Eastern Indian Ocean microcontinent formation driven by plate motion changes
ترجمه فارسی عنوان
شکل گیری میکروکنترلرهای اقیانوس هند در اثر حرکت تغییرات صفحه
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی


- Formation of Batavia and Gulden Draak microcontinents driven by plate motion changes.
- Plume weakening of the Indian continental lithosphere an important precondition.
- 103.5-105 Myr Indian plate motion reorganisation triggered microcontinent formation.

The roles of plate tectonic or mantle dynamic forces in rupturing continental lithosphere remain controversial. Particularly enigmatic is the rifting of microcontinents from mature continental rifted margins, with plume-driven thermal weakening commonly inferred to facilitate calving. However, a role for plate tectonic reorganisations has also been suggested. Here, we show that a combination of plate tectonic reorganisation and plume-driven thermal weakening were required to calve the Batavia and Gulden Draak microcontinents in the Cretaceous Indian Ocean. We reconstruct the evolution of these two microcontinents using constraints from new paleontological samples, 40Ar/39Ar ages, and geophysical data. Calving from India occurred at 101-104 Ma, coinciding with the onset of a dramatic change in Indian plate motion. Critically, Kerguelen plume volcanism does not appear to have directly triggered calving. Rather, it is likely that plume-related thermal weakening of the Indian passive margin preconditioned it for microcontinent formation but calving was triggered by changes in plate tectonic boundary forces.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 454, 15 November 2016, Pages 203-212
نویسندگان
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