scholarly journals A Robust LG‐SIMS Method for Sr Isotope Determination in Apatite Across a Wide Sr Concentration Range

2021 ◽  
Author(s):  
Heejin Jeon ◽  
Martin J. Whitehouse
Keyword(s):  
Sr Isotope ◽  
Isotope Determination

TRACING MOISTURE SOURCES OF THE EXTREME STORM EVENT IMPACTING THE CAROLINAS IN OCTOBER, 2015 USING O, H, AND SR ISOTOPE RATIOS

2016 ◽  
Author(s):  
Donna Surge ◽  
◽  
Karly R. Schmidt ◽  
Corey Moore ◽  
Drew S. Coleman ◽  
...  
Keyword(s):  
Isotope Ratios ◽  
Storm Event ◽  
Sr Isotope ◽  
Moisture Sources ◽  
Extreme Storm

RAPID SR ISOTOPE EXCURSIONS IN THE MARINE RECORD AS A TOOL FOR UNDERSTANDING GLOBAL SEAWATER EVOLUTION

2019 ◽  
Author(s):  
Poul Emsbo ◽  
◽  
W.R. Premo ◽  
Patrick I. McLaughlin ◽  
Leonid A. Neymark
Keyword(s):  
Sr Isotope

Rapid decomposition of geological samples by ammonium bifluoride (NH 4 HF 2 ) for combined Hf‐Nd‐Sr isotope analyses

2021 ◽  
Author(s):  
Gábor Újvári ◽  
Urs Klötzli ◽  
Monika Horschinegg ◽  
Wencke Wegner ◽  
Dorothee Hippler ◽  
...  
Keyword(s):  
Geological Samples ◽  
Sr Isotope ◽  
Rapid Decomposition ◽  
Ammonium Bifluoride ◽  
Isotope Analyses

Hydrothermal Sr contamination of the Dippin sill, Isle of Arran, Western Scotland

1984 ◽  
Vol 48 (348) ◽  
pp. 311-322 ◽  
Author(s):  
A. P. Dickin ◽  
C. M. B. Henderson ◽  
F. G. F. Gibb
Keyword(s):  
Stable Isotope ◽  
Hydrothermal Alteration ◽  
Closed System ◽  
Hydrothermal Systems ◽  
Hydrothermal Fluids ◽  
Drill Core ◽  
Sr Isotope ◽  
Core Section ◽  
High Silica ◽  
Isotope Measurements

Abstract The Dippin sill, which is emplaced into the Triassic sediments of SE Arran, is an alkaline basic sheet which displays pronounced hydrothermal alteration. The 40-m-thick sill has suffered pervasive contamination with radiogenic Sr, introduced from the Triassic sediments by hydrothermal fluids. Stable isotope measurements suggest that fluids were of meteoric origin, but were restricted to a small closed-system circulation. Initial 87Sr/86Sr ratios in the sill were raised from an original value of 0.7032 to a maximum of 0.7091, contamination being especially pronounced near the contacts at Dippin Head itself (localities 12 and 14) and in a drill core section through the sill above Dippin. Hydrothermal Sr was incorporated into an early-formed high-CaO, high-Sr analcime, which replaced unstable high-silica nepheline in interstitial patches. However, this high-CaO analcime, along with plagioclase, was later replaced by a low-CaO, low-Sr analcime, allowing Sr leaching from the margins of the sill. Hydrothermal fluids are thought to have migrated up to 1 km laterally, up the dip of the sill, mainly via tension joints forming in the cooling intrusion. Pooling of hot fluids at the upper end of the sill probably raised water/rock ratios in this region and allowed greater Sr contamination during mineralogical alteration. The undersaturated mineralogy of the sill accounts for its pervasive hydrothermal Sr contamination, which contrasts markedly with the relatively undisturbed Sr isotope compositions of Hebridean granites involved in hydrothermal systems.

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