Growth rate and life span of Eocene/Oligocene Nummulites tests: Inferences from Sr/Ca ratio

S. Sarangi; A. Sarkar; M. M. Sarin; S. K. Bhattacharya; M. Ebihara; A. K. Ray

doi:10.1046/j.1365-3121.2001.00349.x

Growth rate and life span of Eocene/Oligocene Nummulites tests: Inferences from Sr/Ca ratio

S. Sarangi^*, A. Sarkar, M. M. Sarin, S. K. Bhattacharya, M. Ebihara, A. K. Ray

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

The problem of growth rate and life span of Nummulites foraminifers, attaining giant sizes during the Eocene, has been addressed by analysing their Sr/Ca ratio across the Eocene/ Oligocene Boundary (EOB) of Kutch, western India. The Eocene ratio (∼ 1) rapidly decreases during the Oligocene (∼ 0.5) and is coincident with the extinction of most of the Eocene Nummulites species, a rapid enrichment of δ¹⁸O and decrease in both test size and species diversity across the boundary. The high Sr/Ca ratio in Eocene foraminifers can be explained by their rapid growth under a favourable climatic condition. The climatic deterioration (e.g. δ¹⁸O cooling) across the boundary and during the early Oligocene possibly forced the Nummulites to adopt a slower growth rate (and stunted growth). The rapid growth of the Eocene Nummulites indicates that the giant sizes of these protists need not necessarily involve a large life span.

Original language	English
Pages (from-to)	264-269
Number of pages	6
Journal	Terra Nova
Volume	13
Issue number	4
DOIs	https://doi.org/10.1046/j.1365-3121.2001.00349.x
Publication status	Published - 2001 Aug 1
Externally published	Yes

ASJC Scopus subject areas

Geology

Access to Document

10.1046/j.1365-3121.2001.00349.x

Cite this

@article{440fc32312064afea0ef4aabdf208db5,

title = "Growth rate and life span of Eocene/Oligocene Nummulites tests: Inferences from Sr/Ca ratio",

abstract = "The problem of growth rate and life span of Nummulites foraminifers, attaining giant sizes during the Eocene, has been addressed by analysing their Sr/Ca ratio across the Eocene/ Oligocene Boundary (EOB) of Kutch, western India. The Eocene ratio (∼ 1) rapidly decreases during the Oligocene (∼ 0.5) and is coincident with the extinction of most of the Eocene Nummulites species, a rapid enrichment of δ18O and decrease in both test size and species diversity across the boundary. The high Sr/Ca ratio in Eocene foraminifers can be explained by their rapid growth under a favourable climatic condition. The climatic deterioration (e.g. δ18O cooling) across the boundary and during the early Oligocene possibly forced the Nummulites to adopt a slower growth rate (and stunted growth). The rapid growth of the Eocene Nummulites indicates that the giant sizes of these protists need not necessarily involve a large life span.",

author = "S. Sarangi and A. Sarkar and Sarin, {M. M.} and Bhattacharya, {S. K.} and M. Ebihara and Ray, {A. K.}",

year = "2001",

month = aug,

day = "1",

doi = "10.1046/j.1365-3121.2001.00349.x",

language = "English",

volume = "13",

pages = "264--269",

journal = "Terra Nova",

issn = "0954-4879",

publisher = "Wiley-Blackwell",

number = "4",

}

TY - JOUR

T1 - Growth rate and life span of Eocene/Oligocene Nummulites tests

T2 - Inferences from Sr/Ca ratio

AU - Sarangi, S.

AU - Sarkar, A.

AU - Sarin, M. M.

AU - Bhattacharya, S. K.

AU - Ebihara, M.

AU - Ray, A. K.

PY - 2001/8/1

Y1 - 2001/8/1

N2 - The problem of growth rate and life span of Nummulites foraminifers, attaining giant sizes during the Eocene, has been addressed by analysing their Sr/Ca ratio across the Eocene/ Oligocene Boundary (EOB) of Kutch, western India. The Eocene ratio (∼ 1) rapidly decreases during the Oligocene (∼ 0.5) and is coincident with the extinction of most of the Eocene Nummulites species, a rapid enrichment of δ18O and decrease in both test size and species diversity across the boundary. The high Sr/Ca ratio in Eocene foraminifers can be explained by their rapid growth under a favourable climatic condition. The climatic deterioration (e.g. δ18O cooling) across the boundary and during the early Oligocene possibly forced the Nummulites to adopt a slower growth rate (and stunted growth). The rapid growth of the Eocene Nummulites indicates that the giant sizes of these protists need not necessarily involve a large life span.

AB - The problem of growth rate and life span of Nummulites foraminifers, attaining giant sizes during the Eocene, has been addressed by analysing their Sr/Ca ratio across the Eocene/ Oligocene Boundary (EOB) of Kutch, western India. The Eocene ratio (∼ 1) rapidly decreases during the Oligocene (∼ 0.5) and is coincident with the extinction of most of the Eocene Nummulites species, a rapid enrichment of δ18O and decrease in both test size and species diversity across the boundary. The high Sr/Ca ratio in Eocene foraminifers can be explained by their rapid growth under a favourable climatic condition. The climatic deterioration (e.g. δ18O cooling) across the boundary and during the early Oligocene possibly forced the Nummulites to adopt a slower growth rate (and stunted growth). The rapid growth of the Eocene Nummulites indicates that the giant sizes of these protists need not necessarily involve a large life span.

UR - http://www.scopus.com/inward/record.url?scp=0035652521&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035652521&partnerID=8YFLogxK

U2 - 10.1046/j.1365-3121.2001.00349.x

DO - 10.1046/j.1365-3121.2001.00349.x

M3 - Article

AN - SCOPUS:0035652521

SN - 0954-4879

VL - 13

SP - 264

EP - 269

JO - Terra Nova

JF - Terra Nova

IS - 4

ER -

Growth rate and life span of Eocene/Oligocene Nummulites tests: Inferences from Sr/Ca ratio

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this