Classification of Altered Volcanic Island Arc Rocks using Immobile Trace Elements: Development of the Th–Co Discrimination Diagram (original) (raw)

Journal Article

,

1School of Earth, Ocean and Planetary Sciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3YE, UK

Search for other works by this author on:

,

1School of Earth, Ocean and Planetary Sciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3YE, UK

Search for other works by this author on:

,

1School of Earth, Ocean and Planetary Sciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3YE, UK

Search for other works by this author on:

2Department of Geography and Geology, University of the West Indies, Mona, Kingston 7, JAMAICA

Search for other works by this author on:

Received:

03 October 2006

Accepted:

24 September 2007

Published:

25 October 2007

• • Article contents
  • Figures & tables
  • Video
  • Audio
  • Supplementary Data
• Cite

Cite

A. R. Hastie, A. C. Kerr, J. A. Pearce, S. F. Mitchell, Classification of Altered Volcanic Island Arc Rocks using Immobile Trace Elements: Development of the Th–Co Discrimination Diagram, Journal of Petrology, Volume 48, Issue 12, December 2007, Pages 2341–2357, https://doi.org/10.1093/petrology/egm062
Close

Navbar Search Filter Mobile Enter search term Search

Abstract

Many diagrams conventionally used to classify igneous rocks utilize mobile elements, which commonly renders them unreliable for classifying rocks from the geological record. The K2O–SiO2 diagram, used to subdivide volcanic arc rocks into rock type (basalts, basaltic andesites, andesites, dacites and rhyolites) and volcanic series (tholeiitic, calc-alkaline, high-K calc-alkaline and shoshonitic), is particularly susceptible to the effects of alteration. However, by using Th as a proxy for K2O and Co as a proxy for SiO2 it is possible to construct a topologically similar diagram that performs the same task but is more robust for weathered and metamorphosed rocks. This study uses >1000 carefully filtered Tertiary–Recent island arc samples to construct a Th–Co classification diagram. A ‘testing set’ comprising data not used in constructing the diagram indicates a classification success rate of c. 80%. When applied to some hydrothermally altered, then tropically weathered Cretaceous volcanic arc lavas from Jamaica, the diagram demonstrates the presence of a tholeiitic volcanic arc series dominated by intermediate–acid lavas overlain by a calc-alkaline series dominated by basic lavas.

© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

You do not currently have access to this article.

Personal account

• Sign in with email/username & password
• Get email alerts
• Save searches
• Purchase content
• Activate your purchase/trial code
• Add your ORCID iD

Get help with access

Institutional access

Access to content on Oxford Academic is often provided through institutional subscriptions and purchases. If you are a member of an institution with an active account, you may be able to access content in one of the following ways:

IP based access

Typically, access is provided across an institutional network to a range of IP addresses. This authentication occurs automatically, and it is not possible to sign out of an IP authenticated account.

Sign in through your institution

Choose this option to get remote access when outside your institution. Shibboleth/Open Athens technology is used to provide single sign-on between your institution’s website and Oxford Academic.

1. Click Sign in through your institution.
2. Select your institution from the list provided, which will take you to your institution's website to sign in.
3. When on the institution site, please use the credentials provided by your institution. Do not use an Oxford Academic personal account.
4. Following successful sign in, you will be returned to Oxford Academic.

If your institution is not listed or you cannot sign in to your institution’s website, please contact your librarian or administrator.

Sign in with a library card

Enter your library card number to sign in. If you cannot sign in, please contact your librarian.

Society Members

Society member access to a journal is achieved in one of the following ways:

Sign in through society site

Many societies offer single sign-on between the society website and Oxford Academic. If you see ‘Sign in through society site’ in the sign in pane within a journal:

1. Click Sign in through society site.
2. When on the society site, please use the credentials provided by that society. Do not use an Oxford Academic personal account.
3. Following successful sign in, you will be returned to Oxford Academic.

If you do not have a society account or have forgotten your username or password, please contact your society.

Sign in using a personal account

Some societies use Oxford Academic personal accounts to provide access to their members. See below.

Personal account

A personal account can be used to get email alerts, save searches, purchase content, and activate subscriptions.

Some societies use Oxford Academic personal accounts to provide access to their members.

Viewing your signed in accounts

Click the account icon in the top right to:

• View your signed in personal account and access account management features.
• View the institutional accounts that are providing access.

Signed in but can't access content

Oxford Academic is home to a wide variety of products. The institutional subscription may not cover the content that you are trying to access. If you believe you should have access to that content, please contact your librarian.

Institutional account management

For librarians and administrators, your personal account also provides access to institutional account management. Here you will find options to view and activate subscriptions, manage institutional settings and access options, access usage statistics, and more.

Purchase

Short-term Access

To purchase short-term access, please sign in to your personal account above.

Don't already have a personal account? Register

Classification of Altered Volcanic Island Arc Rocks using Immobile Trace Elements: Development of the Th–Co Discrimination Diagram - 24 Hours access

EUR €51.00

GBP £44.00

USD $55.00

Rental

This article is also available for rental through DeepDyve.

Citations

Views

Altmetric

Metrics

Total Views 13,522

9,336 Pageviews

4,186 PDF Downloads

Since 11/1/2016

Citations

726 Web of Science

×

Email alerts

Citing articles via

• Latest

• Most Read

• Most Cited

More from Oxford Academic