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The strontium isotopic composition and origin of burial cements in the Lincolnshire Limestone (Bajocian) of central Lincolnshire, England
Author(s) -
EMERY D.,
DICKSON J. A. D.,
SMALLEY P. C.
Publication year - 1987
Publication title -
sedimentology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.494
H-Index - 108
eISSN - 1365-3091
pISSN - 0037-0746
DOI - 10.1111/j.1365-3091.1987.tb00803.x
Subject(s) - geology , clastic rock , strontium , radiogenic nuclide , isotopes of strontium , paleozoic , geochemistry , carbonate , feldspar , carbonate rock , provenance , sedimentary rock , recrystallization (geology) , mineralogy , paleontology , quartz , chemistry , mantle (geology) , organic chemistry
Strontium isotopic composition ( 87 Sr/ 86 Sr) of two petrographically, chemically and isotopically (δ 18 O and δ 13 C) distinct phases of burial calcites from the Lincolnshire Limestone are indistinguishable (0.70820± 26). The mean 87 Sr/ 86 Sr ratio of these phases is considerably more radiogenic than 87 Sr/ 86 Sr ratios of Bajocian marine waters (∼0.70725). Neither Bajocian marine waters nor meteoric waters buffered by host marine carbonate in the Limestone could have precipitated the burial spars. Radiogenic strontium may have been contributed from K‐feldspar dissolution and/or clay recrystallization, either within clastic portions of the Limestone itself, or from major clastic units adjacent to the Limestone. Alternatively, Palaeozoic marine waters or remobilized Palaeozoic marine carbonate and/or sulphate could have supplied the necessary radiogenic strontium.