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Evidence of Himalayan erosional event at approx. 0.5 Ma from a sediment core from the equatorial Indian Ocean in the vicinityof ODP Leg 116 sites

หน่วยงาน National Institute Of Oceanography (NIO), India

รายละเอียด

ชื่อเรื่อง : Evidence of Himalayan erosional event at approx. 0.5 Ma from a sediment core from the equatorial Indian Ocean in the vicinityof ODP Leg 116 sites
นักวิจัย : Nath, B.N. , Gupta, S.M. , Mislankar, P.G. , Rao, B.R. , Parthiban, G. , Roelandts, I. , Patil, S.K.
คำค้น : erosion , sediments , mineralogy , geochemistry , magnetic susceptibility , rare earths , grain size , organic carbon , terrigenous sediments , detritus
หน่วยงาน : National Institute Of Oceanography (NIO), India
ผู้ร่วมงาน : -
ปีพิมพ์ : 2548
อ้างอิง : Deep-sea research. Part II. Topical studies in oceanography, Vol.52; 2061-2077p. , http://drs.nio.org/drs/handle/2264/946
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : -
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

A sediment core collected from an area _100 miles south of the ODP Leg 116 (distal Bengal Fan) in the equatorial Indian Ocean was investigated for microfossils, mineralogy, mineral chemistry, magnetic susceptibility, grain size, major, minor and rare-earth element geochemistry, organic carbon and total nitrogen contents in the bulk sediments. Distinct changes in depositional characteristics (including presence of abundant sand-sized micas and other detrital minerals) occur at two sub-surface depths corresponding to approx. 0.5 and probably 0.8 Ma time periods. The detrital mineral suite of this core resembles that of turbidite unit 1 sediments of ODP cores in the distal Bengal Fan. The core site has received an increased supply of terrigenous sediments at these two time periods, the older pulse (0.8 Ma) stronger than the younger pulse. Several lines of evidence such as the nature of the mineral suite, lower magnetic susceptibility values, Si/Al in mica mineral separates; major element composition; discrimination plots of Ca/Ti versus K/Ti and K sub(2)O/Al sub(2) O sub(3) and La/Yb ratios suggest a highly metamorphosed source such as higher Himalayan crystalline (HHC) series indicating two events of increased physical weathering and erosion in the Himalayan region. While the erosional event of 0.8 Ma is well known, the episode of 0.5 Ma was not reported earlier.

บรรณานุกรม :
Nath, B.N. , Gupta, S.M. , Mislankar, P.G. , Rao, B.R. , Parthiban, G. , Roelandts, I. , Patil, S.K. . (2548). Evidence of Himalayan erosional event at approx. 0.5 Ma from a sediment core from the equatorial Indian Ocean in the vicinityof ODP Leg 116 sites.
    : National Institute Of Oceanography (NIO), India.
Nath, B.N. , Gupta, S.M. , Mislankar, P.G. , Rao, B.R. , Parthiban, G. , Roelandts, I. , Patil, S.K. . 2548. "Evidence of Himalayan erosional event at approx. 0.5 Ma from a sediment core from the equatorial Indian Ocean in the vicinityof ODP Leg 116 sites".
    : National Institute Of Oceanography (NIO), India.
Nath, B.N. , Gupta, S.M. , Mislankar, P.G. , Rao, B.R. , Parthiban, G. , Roelandts, I. , Patil, S.K. . "Evidence of Himalayan erosional event at approx. 0.5 Ma from a sediment core from the equatorial Indian Ocean in the vicinityof ODP Leg 116 sites."
    : National Institute Of Oceanography (NIO), India, 2548. Print.
Nath, B.N. , Gupta, S.M. , Mislankar, P.G. , Rao, B.R. , Parthiban, G. , Roelandts, I. , Patil, S.K. . Evidence of Himalayan erosional event at approx. 0.5 Ma from a sediment core from the equatorial Indian Ocean in the vicinityof ODP Leg 116 sites. : National Institute Of Oceanography (NIO), India; 2548.