Imperial College London

Dr Craig Smalley

Faculty of EngineeringDepartment of Earth Science & Engineering

Visiting Professor







Royal School of MinesSouth Kensington Campus






BibTex format

author = {Dickson, JAD and Smalley, PC and Raheim, A and Stijfhoorn, DE},
doi = {10.1130/0091-7613(1990)018<0809:ICAOIV>2.3.CO;2},
journal = {Geology},
pages = {809--811},
title = {Intracrystalline carbon and oxygen isotope variations in calcite revealed by laser microsampling},
url = {<0809:ICAOIV>2.3.CO;2},
volume = {18},
year = {1990}

RIS format (EndNote, RefMan)

AB - Vugs in lower Carboniferous limestone from Abercriban, southern Wales, are filled with calcite crystals displaying chemical growth zonation. Nine samples, physically separated from individual growth zones amalgamated from different crystals and analyzed by using standard acid digestion techniques, yielded ranges in δ 13 C and δ 18 O of +0.4‰ to -2.6‰ and -6.3‰ to -9.0‰, respectively. There is a general trend toward lighter carbon- and oxygen-isotope compositions in the younger zones. Thirty laser-ablation analyses of individual ~30-μm-wide zones from the same material revealed a much wider variation in δ 13 C and δ 18 O (+3.8‰ to -3.0‰ and -3.1‰ to -11.0‰), though with similar mean compositions. Significant jumps in isotopic composition were revealed between consecutive growth zones. The high spatial resolution of laser sampling has identified a fine-scale isotopic zonation that has hitherto gone undetected. This zonation suggests that calcite precipitation may be punctuated (or even driven) by changes in nature of pore water and sources of solutes. -from Authors
AU - Dickson,JAD
AU - Smalley,PC
AU - Raheim,A
AU - Stijfhoorn,DE
DO - 10.1130/0091-7613(1990)018<0809:ICAOIV>2.3.CO;2
EP - 811
PY - 1990///
SN - 0091-7613
SP - 809
TI - Intracrystalline carbon and oxygen isotope variations in calcite revealed by laser microsampling
T2 - Geology
UR -<0809:ICAOIV>2.3.CO;2
VL - 18
ER -