Petrographic and chemical characteristics of abyssal tholeiites from Deep Sea Drilling Project Leg 63 off Baja California.

T. Shibata, S. E. Delong, P. Lyman

    Research output: Chapter in Book/Report/Conference proceedingChapter

    1 Citation (Scopus)

    Abstract

    Tholeiitic basalts were obtained from basaltic basement ranging in age from 6 to 17Ma on IPOD/DSDP Leg 63. The main rock types encountered at all sites but 473 are basaltic pillow lavas. Although many of these pillow basalts are highly or moderately altered, fresh glass is usually present. At Site 473, we recovered coarse- grained, massive basalts; no clearly defined pillowed forms were observed. Phenocrysts or microphenocrysts present in the Leg 63 basalts are plagioclase and clinopyroxene at Site 469; olivine, plagioclase, and spinel at Site 470; and olivine, plagioclase, and clinopyroxene at Sites 472 and 473. Olivines of the basalts from Holes 470A and 472 (Fo85-88) are generally more magnesian than those of the Hole 473 basalts (Fo77-81). Also, plagioclases of Holes 470A and 472 basalts (An70-85) are generally more calcic than those of Holes 469 and 473 basalts (An66-72). Geochemical study of the Leg 63 basalts indicates that in all cases they are large-ion-lithophile (LIL) element depleted tholeiites like typical abyssal tholeiites. In particular, they are very similar in composition to those described from the E Pacific, although the degree of iron enrichment found in the Leg 63 basalts is not as extensive as in basalts from the Galapagos spreading center. Hence, the geochemical evidence of the Leg 63 basalts is compatible with their formation at a spreading center. -Authors

    Original languageEnglish
    Title of host publicationInitial reports DSDP, Leg 63, Long Beach, Cal. to Mazatlan, Mexico, (US Govt Printing Office; UK distributors IPOD Committee, NERC, Swindon)
    Pages687-699
    Number of pages13
    Publication statusPublished - 1981

    Fingerprint

    Deep Sea Drilling Project
    basalt
    plagioclase
    olivine
    spreading center
    clinopyroxene
    chemical
    tholeiitic basalt
    spinel
    glass
    iron
    ion

    ASJC Scopus subject areas

    • Earth and Planetary Sciences(all)
    • Environmental Science(all)

    Cite this

    Shibata, T., Delong, S. E., & Lyman, P. (1981). Petrographic and chemical characteristics of abyssal tholeiites from Deep Sea Drilling Project Leg 63 off Baja California. In Initial reports DSDP, Leg 63, Long Beach, Cal. to Mazatlan, Mexico, (US Govt Printing Office; UK distributors IPOD Committee, NERC, Swindon) (pp. 687-699)

    Petrographic and chemical characteristics of abyssal tholeiites from Deep Sea Drilling Project Leg 63 off Baja California. / Shibata, T.; Delong, S. E.; Lyman, P.

    Initial reports DSDP, Leg 63, Long Beach, Cal. to Mazatlan, Mexico, (US Govt Printing Office; UK distributors IPOD Committee, NERC, Swindon). 1981. p. 687-699.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Shibata, T, Delong, SE & Lyman, P 1981, Petrographic and chemical characteristics of abyssal tholeiites from Deep Sea Drilling Project Leg 63 off Baja California. in Initial reports DSDP, Leg 63, Long Beach, Cal. to Mazatlan, Mexico, (US Govt Printing Office; UK distributors IPOD Committee, NERC, Swindon). pp. 687-699.
    Shibata T, Delong SE, Lyman P. Petrographic and chemical characteristics of abyssal tholeiites from Deep Sea Drilling Project Leg 63 off Baja California. In Initial reports DSDP, Leg 63, Long Beach, Cal. to Mazatlan, Mexico, (US Govt Printing Office; UK distributors IPOD Committee, NERC, Swindon). 1981. p. 687-699
    Shibata, T. ; Delong, S. E. ; Lyman, P. / Petrographic and chemical characteristics of abyssal tholeiites from Deep Sea Drilling Project Leg 63 off Baja California. Initial reports DSDP, Leg 63, Long Beach, Cal. to Mazatlan, Mexico, (US Govt Printing Office; UK distributors IPOD Committee, NERC, Swindon). 1981. pp. 687-699
    @inbook{9af32dcbffeb4e5baea45ae14d1559b0,
    title = "Petrographic and chemical characteristics of abyssal tholeiites from Deep Sea Drilling Project Leg 63 off Baja California.",
    abstract = "Tholeiitic basalts were obtained from basaltic basement ranging in age from 6 to 17Ma on IPOD/DSDP Leg 63. The main rock types encountered at all sites but 473 are basaltic pillow lavas. Although many of these pillow basalts are highly or moderately altered, fresh glass is usually present. At Site 473, we recovered coarse- grained, massive basalts; no clearly defined pillowed forms were observed. Phenocrysts or microphenocrysts present in the Leg 63 basalts are plagioclase and clinopyroxene at Site 469; olivine, plagioclase, and spinel at Site 470; and olivine, plagioclase, and clinopyroxene at Sites 472 and 473. Olivines of the basalts from Holes 470A and 472 (Fo85-88) are generally more magnesian than those of the Hole 473 basalts (Fo77-81). Also, plagioclases of Holes 470A and 472 basalts (An70-85) are generally more calcic than those of Holes 469 and 473 basalts (An66-72). Geochemical study of the Leg 63 basalts indicates that in all cases they are large-ion-lithophile (LIL) element depleted tholeiites like typical abyssal tholeiites. In particular, they are very similar in composition to those described from the E Pacific, although the degree of iron enrichment found in the Leg 63 basalts is not as extensive as in basalts from the Galapagos spreading center. Hence, the geochemical evidence of the Leg 63 basalts is compatible with their formation at a spreading center. -Authors",
    author = "T. Shibata and Delong, {S. E.} and P. Lyman",
    year = "1981",
    language = "English",
    pages = "687--699",
    booktitle = "Initial reports DSDP, Leg 63, Long Beach, Cal. to Mazatlan, Mexico, (US Govt Printing Office; UK distributors IPOD Committee, NERC, Swindon)",

    }

    TY - CHAP

    T1 - Petrographic and chemical characteristics of abyssal tholeiites from Deep Sea Drilling Project Leg 63 off Baja California.

    AU - Shibata, T.

    AU - Delong, S. E.

    AU - Lyman, P.

    PY - 1981

    Y1 - 1981

    N2 - Tholeiitic basalts were obtained from basaltic basement ranging in age from 6 to 17Ma on IPOD/DSDP Leg 63. The main rock types encountered at all sites but 473 are basaltic pillow lavas. Although many of these pillow basalts are highly or moderately altered, fresh glass is usually present. At Site 473, we recovered coarse- grained, massive basalts; no clearly defined pillowed forms were observed. Phenocrysts or microphenocrysts present in the Leg 63 basalts are plagioclase and clinopyroxene at Site 469; olivine, plagioclase, and spinel at Site 470; and olivine, plagioclase, and clinopyroxene at Sites 472 and 473. Olivines of the basalts from Holes 470A and 472 (Fo85-88) are generally more magnesian than those of the Hole 473 basalts (Fo77-81). Also, plagioclases of Holes 470A and 472 basalts (An70-85) are generally more calcic than those of Holes 469 and 473 basalts (An66-72). Geochemical study of the Leg 63 basalts indicates that in all cases they are large-ion-lithophile (LIL) element depleted tholeiites like typical abyssal tholeiites. In particular, they are very similar in composition to those described from the E Pacific, although the degree of iron enrichment found in the Leg 63 basalts is not as extensive as in basalts from the Galapagos spreading center. Hence, the geochemical evidence of the Leg 63 basalts is compatible with their formation at a spreading center. -Authors

    AB - Tholeiitic basalts were obtained from basaltic basement ranging in age from 6 to 17Ma on IPOD/DSDP Leg 63. The main rock types encountered at all sites but 473 are basaltic pillow lavas. Although many of these pillow basalts are highly or moderately altered, fresh glass is usually present. At Site 473, we recovered coarse- grained, massive basalts; no clearly defined pillowed forms were observed. Phenocrysts or microphenocrysts present in the Leg 63 basalts are plagioclase and clinopyroxene at Site 469; olivine, plagioclase, and spinel at Site 470; and olivine, plagioclase, and clinopyroxene at Sites 472 and 473. Olivines of the basalts from Holes 470A and 472 (Fo85-88) are generally more magnesian than those of the Hole 473 basalts (Fo77-81). Also, plagioclases of Holes 470A and 472 basalts (An70-85) are generally more calcic than those of Holes 469 and 473 basalts (An66-72). Geochemical study of the Leg 63 basalts indicates that in all cases they are large-ion-lithophile (LIL) element depleted tholeiites like typical abyssal tholeiites. In particular, they are very similar in composition to those described from the E Pacific, although the degree of iron enrichment found in the Leg 63 basalts is not as extensive as in basalts from the Galapagos spreading center. Hence, the geochemical evidence of the Leg 63 basalts is compatible with their formation at a spreading center. -Authors

    UR - http://www.scopus.com/inward/record.url?scp=0019696340&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=0019696340&partnerID=8YFLogxK

    M3 - Chapter

    AN - SCOPUS:0019696340

    SP - 687

    EP - 699

    BT - Initial reports DSDP, Leg 63, Long Beach, Cal. to Mazatlan, Mexico, (US Govt Printing Office; UK distributors IPOD Committee, NERC, Swindon)

    ER -