Palaeoclimate change during Glacial Periods: Evidence from Sri Lanka
In the Earth’s history, there were five major glaciations, namely, Huronian (2,300 Ma),Cryogenianor Sturtian-Varangian(850-635 Ma), Andean-Saharan (460-430 Ma, Karoo (360-260 Ma) andthe Quaternary (2.58 Ma to Present) that occurred between 2,300 Ma and 0.0114 Ma. It is revealed thatGondwanaland emer...
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ftusrijayewarden:oai:ojs.pkp.sfu.ca:article/1122 2024-09-15T17:47:42+00:00 Palaeoclimate change during Glacial Periods: Evidence from Sri Lanka Katupotha, J. 2013-04-24 application/pdf https://journals.sjp.ac.lk/index.php/JTFE/article/view/1122 https://doi.org/10.31357/jtfe.v3i1.1122 eng eng Department of Forestry and Environmental Science https://journals.sjp.ac.lk/index.php/JTFE/article/view/1122/318 10.31357/jtfe.v3i1.1122.g318 https://journals.sjp.ac.lk/index.php/JTFE/article/view/1122 doi:10.31357/jtfe.v3i1.1122 Journal of Tropical Forestry and Environment; Vol. 3 No. 1 (2013) 2235-9362 2235-9370 10.31357/jtfe.v3i1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2013 ftusrijayewarden https://doi.org/10.31357/jtfe.v3i1.112210.31357/jtfe.v3i1 2024-07-29T03:08:49Z In the Earth’s history, there were five major glaciations, namely, Huronian (2,300 Ma),Cryogenianor Sturtian-Varangian(850-635 Ma), Andean-Saharan (460-430 Ma, Karoo (360-260 Ma) andthe Quaternary (2.58 Ma to Present) that occurred between 2,300 Ma and 0.0114 Ma. It is revealed thatGondwanaland emerged between the Huronian glaciation (2300-2100 Ma) in the Paleoproterozoic Eraand the Andean-Saharan glaciation (460-420 Ma) in the Early Paleozoic Era. During this time, mostcontinental land masses were clustered in the southern hemisphere, and Sri Lanka was part of theGondwanaland landmass comprising present day Africa, Madagascar, India and Antarctica. Within theOrdovician (485.4-445.2Ma) to Permian Periods (299.0-254.2 Ma) there were signs of the breaking up ofGondwanaland resulting in the severing of India and Sri Lanka together and subsequently Sri Lanka fromIndia. By end of the Permian Period (260 Ma) Karoo Glaciation had ended and the present Mannar Basindeveloped within a deep canyon (about 4-7 km deep) on the Precambrian basement.Although the island of Sri Lanka presently lies in the Indian Ocean between 5º 52´N-9º 54´N and79º 30´E-81º 55´E, to the southwest of Bay of Bengal and southeast of Arabian Sea, it was positionedwithin 67ºS-65ºS and 34ºE-43ºE during the Lower and Middle Jurassic Era (201.3-166.1 Ma). Huge rockyblocks (erratic boulders) have been transported to different places by continental ice sheets due to climaticchanges in the Permian, Triassic and Jurassic Periods, but erratic pebbles (2 to 8 cm or more in size) andstreams fed deposits have been transported by glacifluvial processes. These glaciofluvial processesoccurred on four occasions during the Jurassic Period and Eocene, Miocene and Pliocene Epochs on SriLankan landmass, which fallowed the climatic changes and sea level fluctuations that broke up thesedimentary beds, initiating establishment of the present topography and structural configuration. As aresult, the earlier sedimentary deposits were obliterated from greater part of Sri ... Article in Journal/Newspaper Antarc* Antarctica Japura Open Journals University of Sri Jayewardenepura Journal of Tropical Forestry and Environment 3 1 |
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In the Earth’s history, there were five major glaciations, namely, Huronian (2,300 Ma),Cryogenianor Sturtian-Varangian(850-635 Ma), Andean-Saharan (460-430 Ma, Karoo (360-260 Ma) andthe Quaternary (2.58 Ma to Present) that occurred between 2,300 Ma and 0.0114 Ma. It is revealed thatGondwanaland emerged between the Huronian glaciation (2300-2100 Ma) in the Paleoproterozoic Eraand the Andean-Saharan glaciation (460-420 Ma) in the Early Paleozoic Era. During this time, mostcontinental land masses were clustered in the southern hemisphere, and Sri Lanka was part of theGondwanaland landmass comprising present day Africa, Madagascar, India and Antarctica. Within theOrdovician (485.4-445.2Ma) to Permian Periods (299.0-254.2 Ma) there were signs of the breaking up ofGondwanaland resulting in the severing of India and Sri Lanka together and subsequently Sri Lanka fromIndia. By end of the Permian Period (260 Ma) Karoo Glaciation had ended and the present Mannar Basindeveloped within a deep canyon (about 4-7 km deep) on the Precambrian basement.Although the island of Sri Lanka presently lies in the Indian Ocean between 5º 52´N-9º 54´N and79º 30´E-81º 55´E, to the southwest of Bay of Bengal and southeast of Arabian Sea, it was positionedwithin 67ºS-65ºS and 34ºE-43ºE during the Lower and Middle Jurassic Era (201.3-166.1 Ma). Huge rockyblocks (erratic boulders) have been transported to different places by continental ice sheets due to climaticchanges in the Permian, Triassic and Jurassic Periods, but erratic pebbles (2 to 8 cm or more in size) andstreams fed deposits have been transported by glacifluvial processes. These glaciofluvial processesoccurred on four occasions during the Jurassic Period and Eocene, Miocene and Pliocene Epochs on SriLankan landmass, which fallowed the climatic changes and sea level fluctuations that broke up thesedimentary beds, initiating establishment of the present topography and structural configuration. As aresult, the earlier sedimentary deposits were obliterated from greater part of Sri ... |
format |
Article in Journal/Newspaper |
author |
Katupotha, J. |
spellingShingle |
Katupotha, J. Palaeoclimate change during Glacial Periods: Evidence from Sri Lanka |
author_facet |
Katupotha, J. |
author_sort |
Katupotha, J. |
title |
Palaeoclimate change during Glacial Periods: Evidence from Sri Lanka |
title_short |
Palaeoclimate change during Glacial Periods: Evidence from Sri Lanka |
title_full |
Palaeoclimate change during Glacial Periods: Evidence from Sri Lanka |
title_fullStr |
Palaeoclimate change during Glacial Periods: Evidence from Sri Lanka |
title_full_unstemmed |
Palaeoclimate change during Glacial Periods: Evidence from Sri Lanka |
title_sort |
palaeoclimate change during glacial periods: evidence from sri lanka |
publisher |
Department of Forestry and Environmental Science |
publishDate |
2013 |
url |
https://journals.sjp.ac.lk/index.php/JTFE/article/view/1122 https://doi.org/10.31357/jtfe.v3i1.1122 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Journal of Tropical Forestry and Environment; Vol. 3 No. 1 (2013) 2235-9362 2235-9370 10.31357/jtfe.v3i1 |
op_relation |
https://journals.sjp.ac.lk/index.php/JTFE/article/view/1122/318 10.31357/jtfe.v3i1.1122.g318 https://journals.sjp.ac.lk/index.php/JTFE/article/view/1122 doi:10.31357/jtfe.v3i1.1122 |
op_doi |
https://doi.org/10.31357/jtfe.v3i1.112210.31357/jtfe.v3i1 |
container_title |
Journal of Tropical Forestry and Environment |
container_volume |
3 |
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1 |
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1810497190501548032 |