Site U1443

Clemens, Steven C.; Kuhnt, Wolfgang; LeVay, Leah J.; Anand, Pallavi; Ando, Takuto; Bartol, Miloš; Bolton, Clara T; Ding, Xing; Gariboldi, Karen; Giosan, Liviu; Hathorne, Edmund C.; Huang, Yin-Sheng; Jaiswal, Priyank; Kim, S.; Kirkpatrick, John B.; Littler, Kate; Marino, Gianluca; Martinez, Philippe; Naik, D.; Peketi, A.; Phillips, Stephen C.; Robinson, Marci M.; Romero, Oscar E; Sagar, Netramani; Taladay, Katie; Taylor, S.N.; Thirumalai, Kaustubh; Uramoto, Go-Ichiro; Usui, Yoichi; Wang, J.; Yamamoto, Michiko; Zhou, Lian-Tong

doi:10.14379/iodp.proc.353.103.2016

Cited by 9 publications

(9 citation statements)

References 49 publications

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“…Site U1443 was a redrill of nearby Ocean Drilling Program (ODP) Site 758 and located on the crest of the NER in the southern Bay of Bengal. This ridge-top location ensured a slow and continuous sedimentation and prevented the deposition of disturbed sedimentary sequences typically associated with transport processes on the Bengal Fan (Clemens et al, 2016). The average sedimentation rates during the Miocene varied between 0.41 cm/kyr in the late to middle Miocene and 0.81 cm/kyr in the early Miocene to Oligocene.…”

Section: Methodsmentioning

confidence: 94%

“…Four holes were combined to form a splice comprising sediments from the Oligocene to the late Pleistocene. The recovered sediment is a nannofossil ooze with varying abundances of detrital clays, foraminifers, and authigenic carbonates (Clemens et al, 2016). The Miocene samples investigated in this study span a composite depth between 125.88 and 152.78 m below seafloor.…”

Section: Methodsmentioning

confidence: 99%

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Provenance and Weathering of Clays Delivered to the Bay of Bengal During the Middle Miocene: Linkages to Tectonics and Monsoonal Climate

Bretschneider

Hathorne

Huang

et al. 2021

Paleoceanog and Paleoclimatol

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Tectonics and regional monsoon strength control weathering and erosion regimes of the watersheds feeding into the Bay of Bengal, which are important contributors to global climate evolution via carbon cycle feedbacks. The detailed mechanisms controlling the input of terrigenous clay to the Bay of Bengal on tectonic to orbital timescales are, however, not yet well understood. We produced orbital-scale resolution geochemical records for International Ocean Discovery Program Site U1443 (southern Bay of Bengal) across five key climatic intervals of the middle to late Miocene (15.8-9.5 Ma). Our new radiogenic Sr, Nd, and Pb isotope time series of clays transported to the Ninetyeast Ridge suggest that the individual contributions from different erosional sources overall remained remarkably consistent during the Miocene despite major tectonic reorganizations in the Himalayas. On orbital timescales, however, high-resolution data from the five investigated intervals show marked fluctuations of all three isotope systems. Interestingly, the variability was much higher within the Miocene Climatic Optimum (around 16-15 Ma) and across the major global cooling (~13.9-13.8 Ma) until~13.5 Ma, than during younger time intervals. This change is attributed to a major restriction on the supply of High Himalayan erosion products due to migration of the peak precipitation area toward the frontal domains of the Himalayas and the Indo-Burman Ranges. The transient excursions of the radiogenic isotope signals on orbital timescales most likely reflect climatically driven shifts in monsoon strength. The continuous sediment archive recovered at International Ocean Discovery Program (IODP) Site U1443 in the Bay of Bengal (Figure 1) now allows a much more detailed study. Lübbers et al. (2019) established a high-resolution benthic stable isotope record from 13.5 to 8.2 Ma for Site U1443, which provides the climatic and stratigraphic framework to reconstruct Himalayan silicate weathering and its relationship to changes of the SAM and climate during the Miocene based on radiogenic isotope compositions of the clay size fraction. Since tectonics, climate, erosion, type, and intensity of weathering and monsoon strength can all affect the

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Section: Methodsmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Provenance and Weathering of Clays Delivered to the Bay of Bengal During the Middle Miocene: Linkages to Tectonics and Monsoonal Climate

Bretschneider

Hathorne

Huang

et al. 2021

Paleoceanog and Paleoclimatol

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“…The sediment consists of calcareous nannofossil ooze with foraminiferal tests and minor amounts of clay, siliceous microfossils, and volcanic ash. Detailed sedimentologic descriptions and physical properties are provided by Clemens et al ().…”

Section: Methodsmentioning

confidence: 99%

The Middle to Late Miocene “Carbonate Crash” in the Equatorial Indian Ocean

Lübbers

Kuhnt

Holbourn

et al. 2019

Paleoceanog and Paleoclimatol

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We integrate benthic foraminiferal stable isotopes, X‐ray fluorescence elemental ratios, and carbonate accumulation estimates in a continuous sedimentary archive recovered at International Ocean Discovery Program Site U1443 (Ninetyeast Ridge, Indian Ocean) to reconstruct changes in carbonate deposition and climate evolution over the interval 13.5 to 8.2 million years ago. Declining carbonate percentages together with a marked decrease in carbonate accumulation rates after ~13.2 Ma signal the onset of a prolonged episode of reduced carbonate deposition. This extended phase, which lasted until ~8.7 Ma, coincides with the middle to late Miocene carbonate crash, originally identified in the eastern equatorial Pacific Ocean and the Caribbean Sea. Interocean comparison reveals that intense carbonate impoverishment at Site U1443 (~11.5 to ~10 Ma) coincides with prolonged episodes of reduced carbonate deposition in all major tropical ocean basins. This implies that global changes in the intensity of chemical weathering and riverine input of calcium and carbonate ions into the ocean reservoir were instrumental in driving the carbonate crash. An increase in U1443 Log (Ba/Ti) together with a change in sediment color from red to green indicate a rise in organic export flux to the sea floor after ~11.2 Ma, which predates the global onset of the biogenic bloom. This early rise in export flux from biological production may have been linked to increased advection of nutrients and intensification of upper ocean mixing, associated with changes in the seasonality and intensity of the Indian Monsoon.

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“…IODP Site U1443 is located in the southernmost Bay of Bengal (BOB) and was cored during Expedition 353 on the crest of the Ninetyeast Ridge (5° 23' 2.94'' N, 90° 21' 40.381'' E, 2924 meters water depth) (Clemens et al, 2016). Site U1443 is a re-drill of Ocean Drilling Program (ODP) Site 758 (Shipboard Scientific Party, 1989).…”

Section: Site Description and Modern Oceanographymentioning

confidence: 99%

Drivers of late Miocene tropical sea surface cooling: a new perspective from the equatorial Indian Ocean

Martinot

Bolton

Sarr

et al. 2021

Preprint

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Site U1443

Abstract: Background and objectives 3 Operations 7 Lithostratigraphy 14 Biostratigraphy 20 Geochemistry 23 Paleomagnetism 34 Physical properties 38 Stratigraphic correlation 39 References

Cited by 9 publications

References 49 publications

Provenance and Weathering of Clays Delivered to the Bay of Bengal During the Middle Miocene: Linkages to Tectonics and Monsoonal Climate

Provenance and Weathering of Clays Delivered to the Bay of Bengal During the Middle Miocene: Linkages to Tectonics and Monsoonal Climate

The Middle to Late Miocene “Carbonate Crash” in the Equatorial Indian Ocean

Drivers of late Miocene tropical sea surface cooling: a new perspective from the equatorial Indian Ocean

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