The Peninsular Ranges Batholith: an insight into the evolution of the Cordilleran batholiths of southwestern North America
ABSTRACT The Peninsular Ranges Batholith of southern and Baja California is the largest segment of a Cretaceous magmatic arc that was once continuous from northern California to southern Baja California. In this batholith, the emplacement of igneous rocks took place during a single sequence of magma...
Published in: | Earth and Environmental Science Transactions of the Royal Society of Edinburgh |
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1988
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Online Access: | http://dx.doi.org/10.1017/s0263593300014152 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0263593300014152 |
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crcambridgeupr:10.1017/s0263593300014152 2024-03-03T08:43:52+00:00 The Peninsular Ranges Batholith: an insight into the evolution of the Cordilleran batholiths of southwestern North America Silver, L. T. Chappell, B. W. 1988 http://dx.doi.org/10.1017/s0263593300014152 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0263593300014152 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Earth and Environmental Science Transactions of the Royal Society of Edinburgh volume 79, issue 2-3, page 105-121 ISSN 1755-6910 1755-6929 General Earth and Planetary Sciences General Environmental Science journal-article 1988 crcambridgeupr https://doi.org/10.1017/s0263593300014152 2024-02-08T08:38:15Z ABSTRACT The Peninsular Ranges Batholith of southern and Baja California is the largest segment of a Cretaceous magmatic arc that was once continuous from northern California to southern Baja California. In this batholith, the emplacement of igneous rocks took place during a single sequence of magmatic activity, unlike many of the other components of the Cordilleran batholiths which formed during successive separate magmatic episodes. Detailed radiometric dating has shown that it is a composite of two batholiths. A western batholith, which was more heterogeneous in composition, formed as a static magmatic arc between 140 and 105 Ma and was intrusive in part into related volcanic rocks. The eastern batholith formed as a laterally transgressing arc which moved away from those older rocks between 105 and 80 Ma, intruding metasedimentary rocks. Rocks of the batholith range from undersaturated gabbros through to felsic granites, but tonalite is the most abundant rock throughout. Perhaps better than elsewhere in the Cordillera, the batholith shows beautifully developed asymmetries in chemical and isotopic properties. The main gradients in chemical composition from W to E are found among the trace elements, with Ba, Sr, Nb and the light rare earth elements increasing by more than a factor of two, and P, Rb, Pb, Th, Zn and Ga showing smaller increases. Mg and the transition metals decrease strongly towards the E, with Sc, V and Cu falling to less than half of their value in the most westerly rocks. Oxygen becomes very systematically more enriched in 18 O from W to E and the Sr, Nd and Pb isotopic systems change progressively from mantle values in the W to a more evolved character on the eastern side of the batholith. In detail the petrogenesis of the Peninsular Ranges Batholith is not completely understood, but many general aspects of the origin are clear. The exposed rocks, particularly in the western batholith, closely resemble those of present day island arcs, although the most typical and average tonalitic ... Article in Journal/Newspaper Day Island Cambridge University Press Baja Earth and Environmental Science Transactions of the Royal Society of Edinburgh 79 2-3 105 121 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
General Earth and Planetary Sciences General Environmental Science |
spellingShingle |
General Earth and Planetary Sciences General Environmental Science Silver, L. T. Chappell, B. W. The Peninsular Ranges Batholith: an insight into the evolution of the Cordilleran batholiths of southwestern North America |
topic_facet |
General Earth and Planetary Sciences General Environmental Science |
description |
ABSTRACT The Peninsular Ranges Batholith of southern and Baja California is the largest segment of a Cretaceous magmatic arc that was once continuous from northern California to southern Baja California. In this batholith, the emplacement of igneous rocks took place during a single sequence of magmatic activity, unlike many of the other components of the Cordilleran batholiths which formed during successive separate magmatic episodes. Detailed radiometric dating has shown that it is a composite of two batholiths. A western batholith, which was more heterogeneous in composition, formed as a static magmatic arc between 140 and 105 Ma and was intrusive in part into related volcanic rocks. The eastern batholith formed as a laterally transgressing arc which moved away from those older rocks between 105 and 80 Ma, intruding metasedimentary rocks. Rocks of the batholith range from undersaturated gabbros through to felsic granites, but tonalite is the most abundant rock throughout. Perhaps better than elsewhere in the Cordillera, the batholith shows beautifully developed asymmetries in chemical and isotopic properties. The main gradients in chemical composition from W to E are found among the trace elements, with Ba, Sr, Nb and the light rare earth elements increasing by more than a factor of two, and P, Rb, Pb, Th, Zn and Ga showing smaller increases. Mg and the transition metals decrease strongly towards the E, with Sc, V and Cu falling to less than half of their value in the most westerly rocks. Oxygen becomes very systematically more enriched in 18 O from W to E and the Sr, Nd and Pb isotopic systems change progressively from mantle values in the W to a more evolved character on the eastern side of the batholith. In detail the petrogenesis of the Peninsular Ranges Batholith is not completely understood, but many general aspects of the origin are clear. The exposed rocks, particularly in the western batholith, closely resemble those of present day island arcs, although the most typical and average tonalitic ... |
format |
Article in Journal/Newspaper |
author |
Silver, L. T. Chappell, B. W. |
author_facet |
Silver, L. T. Chappell, B. W. |
author_sort |
Silver, L. T. |
title |
The Peninsular Ranges Batholith: an insight into the evolution of the Cordilleran batholiths of southwestern North America |
title_short |
The Peninsular Ranges Batholith: an insight into the evolution of the Cordilleran batholiths of southwestern North America |
title_full |
The Peninsular Ranges Batholith: an insight into the evolution of the Cordilleran batholiths of southwestern North America |
title_fullStr |
The Peninsular Ranges Batholith: an insight into the evolution of the Cordilleran batholiths of southwestern North America |
title_full_unstemmed |
The Peninsular Ranges Batholith: an insight into the evolution of the Cordilleran batholiths of southwestern North America |
title_sort |
peninsular ranges batholith: an insight into the evolution of the cordilleran batholiths of southwestern north america |
publisher |
Cambridge University Press (CUP) |
publishDate |
1988 |
url |
http://dx.doi.org/10.1017/s0263593300014152 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0263593300014152 |
geographic |
Baja |
geographic_facet |
Baja |
genre |
Day Island |
genre_facet |
Day Island |
op_source |
Earth and Environmental Science Transactions of the Royal Society of Edinburgh volume 79, issue 2-3, page 105-121 ISSN 1755-6910 1755-6929 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0263593300014152 |
container_title |
Earth and Environmental Science Transactions of the Royal Society of Edinburgh |
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79 |
container_issue |
2-3 |
container_start_page |
105 |
op_container_end_page |
121 |
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