東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Paleoglaciology of the Tian Shan and...

Blomdin, Robin.

FindBook

Google Book

Amazon

博客來

Paleoglaciology of the Tian Shan and Altai Mountains, Central Asia.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Paleoglaciology of the Tian Shan and Altai Mountains, Central Asia./
作者:	Blomdin, Robin.
面頁冊數:	155 p.
附註:	Source: Masters Abstracts International, Volume: 55-02.
Contained By:	Masters Abstracts International55-02(E).
標題:	Geomorphology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1602583
ISBN:	9781339181219

Paleoglaciology of the Tian Shan and Altai Mountains, Central Asia.
Blomdin, Robin.

Paleoglaciology of the Tian Shan and Altai Mountains, Central Asia. - 155 p.

Source: Masters Abstracts International, Volume: 55-02.

Thesis (M.S.)--Purdue University, 2015.

Central Asia is home to some of the highest and most spectacular mountain ranges in the world, including the Tian Shan and Altai Mountains, and plays a major role in global and regional climate and hydrology. Understanding the glacial history of this vast region is important for several reasons, but in particular there is a general lack of paleoclimatic data from this highly continental region, at the confluence of major climate systems, and glaciers are sensitive monitors of climate change. This thesis examines the pattern and history of glacial deposition and erosion in the Tian Shan and Altai Mountains using a combined approach including 1) geomorphological mapping, 2) spatial analysis of glacial geomorphology, 3) hypsometry, 4) Equilibrium Line Altitudes (ELA), and 5) 10Be exposure dating of erratic boulders on glacial landforms. Preliminary mapping of the Altai Mountains suggests the area mainly experienced alpine style glaciations, with glacial centers as ice caps and ice fields located around the higher mountainous areas. This is consistent with previous work on the Tian Shan. For the Tian Shan we have new apparent minimum 10Be exposure ages from ~0.2 ka to ~ 180 ka, with large site-specific scatter. Most of our apparent exposure ages come from boulders with an age range between 30 ka to 0.2 ka. Although we recognize that more studies combining mapping, dating and modeling are needed to understand the full history of past glaciation in this region, our conclusions to date include: 1) The oldest recorded glacial event occurred in the Taragay Basin in the Tian Shan, dated to 92.1+/-11.4 ka, and two MIS 2 glacial advances have been recorded on opposite sides of the Ak-Shyrak Range, dated to 16.0+/-3.4 and 17.3+/-4.7 ka respectively. 2) Remote-sensing-based mapping and cosmogenic nuclide dating indicate that Pleistocene glaciations were restricted to the mountains and plateau areas of the Tian Shan. 3) Glaciation ages indicate that glacial events occurred during, MIS 2, 3 and 5. 4) There are no regional spatial trends in changes in ELA (DeltaELA) however, when comparing the distribution of ELAs to the hypsometric signature (area elevation relationship) of individual catchments across the Tian Shan, there is a range of cases from valleys experiencing "typical" or "extensive" modes of glaciation, where paleo ELAs coincide with hypsometric maxima (peaks in area-elevation curves), to valleys with more complicated signatures, either reflecting "dynamic" or "limited" glaciations at H MAX. This suggests that in future work "typical" catchments should be targeted for geochronological studies and paleo-ELA reconstructions. 5) Finally, when comparing deglaciation ages to global and regional climate records we observe both northern hemispheric and monsoonal signatures as potential drivers behind glacial expansions in the Tian Shan.

ISBN: 9781339181219Subjects--Topical Terms:

542703
Geomorphology.

Paleoglaciology of the Tian Shan and Altai Mountains, Central Asia.
LDR:03729nmm a2200289 4500 001 2077335
005 20161114130254.5
008 170521s2015 ||||||||||||||||| ||eng d
020 $a 9781339181219
035 $a (MiAaPQ)AAI1602583
035 $a AAI1602583
040 $a MiAaPQ $c MiAaPQ
100 1 $a Blomdin, Robin. $3 3192838
245 1 0 $a Paleoglaciology of the Tian Shan and Altai Mountains, Central Asia.
300 $a 155 p.
500 $a Source: Masters Abstracts International, Volume: 55-02.
500 $a Adviser: Jonathan M. Harbor.
502 $a Thesis (M.S.)--Purdue University, 2015.
520 $a Central Asia is home to some of the highest and most spectacular mountain ranges in the world, including the Tian Shan and Altai Mountains, and plays a major role in global and regional climate and hydrology. Understanding the glacial history of this vast region is important for several reasons, but in particular there is a general lack of paleoclimatic data from this highly continental region, at the confluence of major climate systems, and glaciers are sensitive monitors of climate change. This thesis examines the pattern and history of glacial deposition and erosion in the Tian Shan and Altai Mountains using a combined approach including 1) geomorphological mapping, 2) spatial analysis of glacial geomorphology, 3) hypsometry, 4) Equilibrium Line Altitudes (ELA), and 5) 10Be exposure dating of erratic boulders on glacial landforms. Preliminary mapping of the Altai Mountains suggests the area mainly experienced alpine style glaciations, with glacial centers as ice caps and ice fields located around the higher mountainous areas. This is consistent with previous work on the Tian Shan. For the Tian Shan we have new apparent minimum 10Be exposure ages from ~0.2 ka to ~ 180 ka, with large site-specific scatter. Most of our apparent exposure ages come from boulders with an age range between 30 ka to 0.2 ka. Although we recognize that more studies combining mapping, dating and modeling are needed to understand the full history of past glaciation in this region, our conclusions to date include: 1) The oldest recorded glacial event occurred in the Taragay Basin in the Tian Shan, dated to 92.1+/-11.4 ka, and two MIS 2 glacial advances have been recorded on opposite sides of the Ak-Shyrak Range, dated to 16.0+/-3.4 and 17.3+/-4.7 ka respectively. 2) Remote-sensing-based mapping and cosmogenic nuclide dating indicate that Pleistocene glaciations were restricted to the mountains and plateau areas of the Tian Shan. 3) Glaciation ages indicate that glacial events occurred during, MIS 2, 3 and 5. 4) There are no regional spatial trends in changes in ELA (DeltaELA) however, when comparing the distribution of ELAs to the hypsometric signature (area elevation relationship) of individual catchments across the Tian Shan, there is a range of cases from valleys experiencing "typical" or "extensive" modes of glaciation, where paleo ELAs coincide with hypsometric maxima (peaks in area-elevation curves), to valleys with more complicated signatures, either reflecting "dynamic" or "limited" glaciations at H MAX. This suggests that in future work "typical" catchments should be targeted for geochronological studies and paleo-ELA reconstructions. 5) Finally, when comparing deglaciation ages to global and regional climate records we observe both northern hemispheric and monsoonal signatures as potential drivers behind glacial expansions in the Tian Shan.
590 $a School code: 0183.
650 4 $a Geomorphology. $3 542703
650 4 $a Remote sensing. $3 535394
650 4 $a Geophysics. $3 535228
690 $a 0484
690 $a 0799
690 $a 0373
710 2 $a Purdue University. $b Earth, Atmospheric and Planetary Sciences. $3 2106006
773 0 $t Masters Abstracts International $g 55-02(E).
790 $a 0183
791 $a M.S.
792 $a 2015
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1602583