کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1036043 943873 2011 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A rock magnetic record of Pleistocene rainfall variations at the Palaeolithic site of Attirampakkam, Southeastern India
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
A rock magnetic record of Pleistocene rainfall variations at the Palaeolithic site of Attirampakkam, Southeastern India
چکیده انگلیسی

Attirampakkam, an open-air stratified Palaeolithic site in southeastern India is the focus of ongoing studies to investigate the nature of Lower and Middle Palaeolithic occupation in relation to changing Pleistocene environments. The paucity of faunal or palaeobotanical remains at the site required the use of rock magnetic properties (χlf, χfd, χfd %, χARM, SIRM, χARM/SIRM, SIRM/χlf, χARM/χlf, χARM/χfd, S-ratio, HIRM and HIRM/IRM300mT) as proxies for deciphering the palaeoenvironments and palaeoclimates of the region. Rock magnetic data from stratified deposits within excavated trenches show that the bulk of the sedimentation was intermittent with no subaerial exposure of sediments for long periods, and points to fluctuating wetter and drier climates associated with the Acheulian to Late Middle Palaeolithic levels. There is a general trend towards a wetter climate from Layer 5 upwards. Layer 7 offers evidence of bacterial magnetite (χARM/χlf > 40 and χARM/χfd > 1000), suggesting the onset of micro-anaerobic environments as a result of floods. Greigite is indicated in Layer 5 (SIRM/χlf > 30 × 103 A m−1), which indicates a reducing environment. Layer 2 represents an arid climate (higher proportion of haematite and a coarser magnetic grain size). Layer 1a again is indicative of an arid climate (presence of calcrete, magnetically “hard” minerals and coarser magnetic grain size). Results indicate that the southeast coast of India experienced a mostly dry tropical climate during the Pleistocene. The detected occurrence of a few notably more arid intervals did not disrupt occupation of the site by successive groups of hominins.


► Rock magnetic investigations carried out on Attirampakkam, a fluvial Palaeolithic site in SE India.
► Data obtained indicates that sedimentation was intermittent with no subaerial exposure of sediments for longer duration.
► Changing regimes of wet and dry climate associated with Acheulian to late Middle Palaeolithic levels.
► Results indicate that the SE India experienced a mostly dry tropical climate during the Pleistocene.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Archaeological Science - Volume 38, Issue 12, December 2011, Pages 3681–3693
نویسندگان
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