The Relevance of Rb-Sr, Sm-Nd, and Pb-Pb Isotope Systematics to Elucidation of the Genesis and History of Recent Andesite Flows at Mt. Ngauruhoe, New Zealand, and the Implications for Radioisotopic Dating | The Institute for Creation Research
 
The Relevance of Rb-Sr, Sm-Nd, and Pb-Pb Isotope Systematics to Elucidation of the Genesis and History of Recent Andesite Flows at Mt. Ngauruhoe, New Zealand, and the Implications for Radioisotopic Dating

Download PDFDownload The Relevance of Rb-Sr, Sm-Nd, and Pb-Pb Isotope Systematics to Elucidation of the Genesis and History of Recent Andesite Flows at Mt. Ngauruhoe, New Zealand, and the Implications for Radioisotopic Dating PDF

Presented at the Fifth International Conference on Creationism, Pittsburgh, Pennsylvania, August 4–9, 2003 and published in: Proceedings of the Fifth International Conference on Creationism, R. L. Ivey Jr. (Ed.), pp. 285–303.

© Copyright 2003 by Creation Science Fellowship, Inc., Pittsburgh, Pennsylvania, USA. All Rights Reserved.

Abstract

Mt. Ngauruhoe in the Taupo Volcanic Zone of New Zealand erupted andesite lava flows in 1949 and 1954, and avalanche deposits in 1975. Rb-Sr, Sm-Nd, and Pb-Pb radioisotopic analyses of samples of these andesites, as anticipated, did not yield any “age” information, although the Pb isotopic data are strongly linear. When compared with recent andesite flows from the related adjacent Ruapehu volcano, the Sr-Nd-Pb radioisotopic systems plotted on correlation diagrams provide information about the depleted mantle source for the parental basalt magmas and the source of the crustal contamination that produced the andesite lavas from them. The variations in both the depleted mantle Nd “model ages” and the Pb isotopes also suggest radioisotopic heterogeneity in the mantle wedge 80 km below the volcano where partial melting has occurred, contaminated by mixing with trench sediments scraped off the interface with the subducting slab. Thus the radioisotopic ratios in these recent Ngauruhoe andesite flows were inherited, and reflect the origin and history of the mantle and crustal sources from which the magma was generated. By implication, the radioisotopic ratios in ancient lavas throughout the geologic record are likely fundamental to their geochemistry, characteristic of their origin and history rather than necessarily providing valid conventional “ages.”

Keywords

Andesite, 1949–1975 flows, Mt. Ngauruhoe, New Zealand, Rb-Sr, Sm-Nd, Pb-Pb, Radioisotopes, Petrogenesis, Depleted Mantle, Magma Genesis, Crustal Contamination, Subduction, Mixing, Inherited Radioisotopic Ratios, Invalid Conventional “Ages”

For Full Text

Please see the Download PDF link above for the entire article.

The Latest
NEWS
''Bird-Like'' Tracks Before Birds
Scientists have found what appears to be fossil bird tracks in rocks claimed to be 60 million years older than the oldest bird fossils.1...

NEWS
December 2023 ICR Wallpaper
"And she will bring forth a Son, and you shall call His name Jesus, for He will save His people from their sins." Matthew 1:21 NKJV ICR...

NEWS
Renowned Chemist on Origin-of-Life: Put Up Or Shut Up
For some time now, renowned and award-winning Rice University chemist and outspoken Christian Dr. James Tour has been exposing the fact that origin-of-life...

NEWS
Butterflies and Cancer Detection
It’s something right out of science fiction. The beautiful, flighty butterfly has been discovered to have cancer detection properties via the...

ACTS & FACTS
Kids Edition 2023: Good Stewards
Hi, kids! We created a special Acts & Facts just for you! Have fun doing the activities while learning about the wonderful world God...

ACTS & FACTS
Kids Edition 2023: Rainbows
Hi, kids! We created a special Acts & Facts just for you! Have fun doing the activities while learning about the wonderful world God...

ACTS & FACTS
Kids Edition 2023: Gemstones & Jewels
Hi, kids! We created a special Acts & Facts just for you! Have fun doing the activities while learning about the wonderful world God...

ACTS & FACTS
Kids Edition 2023: Black Holes
Hi, kids! We created a special Acts & Facts just for you! Have fun doing the activities while learning about the wonderful world God...

ACTS & FACTS
Kids Edition 2023: Ice Age
Hi, kids! We created a special Acts & Facts just for you! Have fun doing the activities while learning about the wonderful world God...

ACTS & FACTS
Kids Edition 2023: Dinosaurs & Birds
Hi, kids! We created a special Acts & Facts just for you! Have fun doing the activities while learning about the wonderful world God...