RISS 학술연구정보서비스

검색
다국어 입력

http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.

변환된 중국어를 복사하여 사용하시면 됩니다.

예시)
  • 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
  • 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
닫기
    인기검색어 순위 펼치기

    RISS 인기검색어

      검색결과 좁혀 보기

      선택해제

      오늘 본 자료

      • 오늘 본 자료가 없습니다.
      더보기
      • 무료
      • 기관 내 무료
      • 유료
      • Optical dating of late Quaternary carbonate sequences of Saurashtra, western India

        Sharma, Komal,Bhatt, Nilesh,Shukla, Anil Dutt,Cheong, Dae-Kyo,Singhvi, Ashok Kumar Cambridge University Press 2017 Quaternary research Vol.87 No.1

        <B>Abstract</B><P>Bioclastic carbonate deposits that formed because of a combination of nearshore marine, fluvial, and aeolian processes, occur along the Saurashtra coast and in the adjacent interior regions of western India. Whether these carbonates formed by marine or aeolian processes has been debated for many decades. The presence of these deposits inland poses questions as to whether they are climate controlled or attributable to postdepositional tectonic uplift. In particular, the debate centres on chronologic issues including (1) appropriate sampling strategies and (2) the use of <SUP>230</SUP>Th/<SUP>234</SUP>U and <SUP>14</SUP>C ages on the bulk carbonates. Using traces (<1%) of quartz grains trapped in carbonate matrices, optically stimulated luminescence (OSL) dating of quartz grains, deposited along with the carbonate grains, provides ages for the most recent deposition events. The OSL ages range from >165 to 44 ka for the shell limestones, 75-17 ka for the fluvially reworked sheet deposits, and 80-11 ka for miliolites deposited by aeolian processes. These are younger than the <SUP>230</SUP>Th/<SUP>234</SUP>U and <SUP>14</SUP>C ages and suggest that the inland carbonate deposits were reworked from older carbonate sediments that were transported during more arid phases.</P>

      연관 검색어 추천

      이 검색어로 많이 본 자료

      활용도 높은 자료

      해외이동버튼