The origin and evolution of lavas from Haleakala Crater, Hawaii

Simple item page
dc.contributor.advisorLeeman, William P.en_US
dc.creatorWest, Howard Bruceen_US
dc.date.accessioned2009-06-04T00:19:47Zen_US
dc.date.available2009-06-04T00:19:47Zen_US
dc.date.issued1988en_US
dc.description.abstractSr, Nd, and Pb isotope systematics of lavas from the Maui Volcanic Complex (MVC) are consistent with a three-component petrogenetic mixing model. MVC shield-building (SB) lavas define linear trends on isotope-isotope plots, consistent with two-component mixing between primitive (PM) and enriched (EM) mantle components. The two-component (PM-EM) Hawaiian plume source is variable in composition during production of tholeiite magmas even within a single shield. Sr and Pb isotopic ratios of Haleakala post shield-building (PSB) lavas define a strong positively correlated array that deviates from the SB array towards an unradiogenic end-member. The PSB array may therefore result from time- and volume-dependent binary mixing between Hawaiian plume melts and a depleted (DM) mantle (i.e. MORB source) component. Several trace element ratios in Haleakala PSB lavas are correlated with isotopic compositions but not with major and trace element contents, and therefore appear to reflect changes in source composition. Trace element mixing systematics for these lavas indicate that the DM component must be a melt. The inferred PM component has chondritic ratios for several trace elements, consistent with it representing primitive mantle. The EM component may represent a part of the Hawaiian plume source that was either metasomatized or metasomatically scavenged. Alkalic cap lavas exposed in the northwest wall of Haleakala Crater display systematic, upsection geochemical variations indicative of the repetitive intrusion of discrete magma batches. Magma batches are separated by geochemical discontinuities characterized by abrupt upsection increases in incompatible element contents and commensurate drops in compatible element contents. In contrast, lava compositions within magma batches vary upsection progressively, and geochemical variations are opposite to those observed for interbatch discontinuities. Together, these geochemical variations are interpreted as resulting from the cyclic operation of a dynamic, evolving, open system magma chamber. Interbatch transitions appear to reflect periods of eruptive quiessence characterized by low magma recharge rates and relatively high degrees of crystal fractionation. Intrabatch variations appear to represent eruptive periods characterized by relatively high recharge rates, low degrees of crystal frationation, and progressive mixing of evolved rest magma with more primitive recharge magma.en_US
dc.format.extent360 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoThesis Geol. 1988 Westen_US
dc.identifier.citationWest, Howard Bruce. "The origin and evolution of lavas from Haleakala Crater, Hawaii." (1988) Diss., Rice University. <a href="https://hdl.handle.net/1911/16199">https://hdl.handle.net/1911/16199</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/16199en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectGeologyen_US
dc.subjectGeochemistryen_US
dc.titleThe origin and evolution of lavas from Haleakala Crater, Hawaiien_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentEarth Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
8900293.PDF
Size:
9.19 MB
Format:
Adobe Portable Document Format
Download
Collections
Rice University Theses and Dissertations