Rare earth, major, and trace element composition of Monterey and DSDP chert and associated host sediment: Assessing the influence of chemical fractionation during diagenesis

Murray, Richard W; Brink, Marilyn R. Buchholtz ten; Gerlach, David C.; Russ, G. P.; Jones, David L.

doi:10.1016/0016-7037(92)90351-i

Cited by 107 publications

(66 citation statements)

References 41 publications

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“…Chemical analyses indicate that sample YN1 from the ophiolitic mélange belongs to the pure siliceous rock of Murray et al [27] , 94.12% of SiO 2 with very few terrigenous mud (Table 1). However, four chert samples from the Pomulong mélange (J 3 K 1 P M ) and four other chert samples from the Zombe mélange (T 2-3 Z M ) contain less SiO 2 and more terrigenous mud than that of the sample YN1, which are consistent with their geological occurrence.…”

Section: Major Elementmentioning

confidence: 96%

“…The Ce/Ce* ratio is 0.3±0.13 for the siliceous sediments from the oceanic ridge basin, 0.60±0.13 for the sediments in oceanic basin, and 1.09±0.25 for those in continental margin basin. The ranges of La N /Ce N ratios for sedimentary chert from oceanic ridge, oceanic and continental margin basin are 3.5, 1.0-2.5, and 0.5-1.5 respectively [27,33,35] . Table 1 Major elements (%) and rare earth elements (10 −6 ) in the cherts from the Yarlung Zangbo suture zone a) The silicalites are analyzed by ICP-MS and international standards for rare earth elements and by X-fluorescence spectrum for major elements in Hubei Institute of Geological Experiment.…”

Section: Reementioning

confidence: 99%

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Mesozoic radiolarian chert from the middle sector of the Yarlung Zangbo suture zone, Tibet and its tectonic implications

Zhu

Liu

et al. 2006

SCI CHINA SER D

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Three radiolarian fauna, aged as the Middle-Late Triassic, Late Jurassic-Early Cretaceous and Cretaceous radiolarian fauna, have been recognised in the radiolarian cherts from the middle sector of the Yarlung Zangbo suture zone, southern Tibet, China. The average contents of SiO 2 in the radiolarian cherts of the Middle-Late Triassic and Late Jurassic-Early Cretaceous are 90.24% and 92.58% respectively, with average ratios of Al/(Al+Fe+Mn) as 0.75 and 0.74 respectively, the average ratios of MnO/TiO 2 as 0.36 and 1.24, the average ratios of Ce/Ce* as 1.15 and 1.03, and the average ratios of La N /Ce N as 0.85 and 0.93. These geochemical features indicate that both of them are biogenic, deposited in a continental margin basin. The SiO 2 content of the Early Cretaceous radiolarian chert is 94.12%, with the ratio of Al/(Al+Fe+Mn) as 0.59, ratio of MnO/TiO 2 as 4.30, ratio of Ce/Ce* as 0.60, ratio of La N /Ce N as 1.59, which imply that the chert is biogenic and was deposited in a pelagic basin. The Middle-Late Triassic association of the radiolarian chert and turbidites as well as their geochemical characteristics indicates the existence of a strong rifting marginal basin in the belt of the Yarlung Zangbo River then. The association of radiolarian chert and bedded basalt indicate an initial Tethyan ocean basin in southern Tibet during the Late Jurassic-Early Cretaceous. The early Cretaceous radiolarian chert coexisting with pillow basalt in top of the ophiolite suite represents sediments from the oceanic Tethyan basin.

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Section: Major Elementmentioning

confidence: 96%

Section: Reementioning

confidence: 99%

Mesozoic radiolarian chert from the middle sector of the Yarlung Zangbo suture zone, Tibet and its tectonic implications

Zhu

Liu

et al. 2006

SCI CHINA SER D

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“…In order to compensate this dilution effect, normalization of constituent elements by Al or Ti have often been used (e.g., Murray et al, 1992a;Murray, 1994;Sugisaki et al, 1982;Yamamoto, 1983), based on that Al and Ti are incorporated mostly in lithogenic fraction and are not mobile during diagenesis. By using element/TiO 2 or element/Al 2 O 3 ratios, therefore, we could compare degree of elemental enrichment between bedded cherts and nonsiliceous marine sediments.…”

Section: Comparison Of Raw Data Of Cherts and Shales And Its Limitsmentioning

confidence: 99%

Biogeochemical signatures preserved in ancient siliceous sediments; new perspectives to Triassic radiolarian bedded chert compositions

et al. 2006

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Major and minor elements of successively collected 70 Middle Triassic radiolarian bedded cherts from the Mino Belt in central Japan were studied. In order to reveal pre-diagenetic, primary geochemical signatures related to marine biogeochemical cycles, composite data of chert-shale couplets in addition to raw data were examined. The results show that Mn, Cu, Sr, Ba and P were supplied significantly by non-lithogenic excess fractions. Positive correlation with SiO 2 / TiO 2 suggests that accumulations of Ba, Sr, Mn and Cu were closely related to sedimentation of biogenic silica; Mn and Cu were probably incorporated into oxides, whereas Ba into barite. Relationship between SiO 2 /TiO 2 and excess-Ba, proxy for surface productivity implies that regeneration of silica from sinking radiolarian tests was not significant. This may have been caused by an expected relatively short travel time of radiolarian tests from the ocean surface to the bottom, reflecting their large size compared with diatoms. Positive correlations between CaO and P 2 O 5 imply that apatite species are host phases for P and Ca. Although conodont composed of apatite is abundant in both chert and shale, their CaO/P 2 O 5 ratio differs markedly from those of cherts and shales. Other apatite species, possibly carbonate apatite of diagenetic origin, are present in the bedded cherts and contribute to excess-P accumulation. Early diagenesis is believed to have modified only slightly primary geochemical features of the studied bedded cherts. This suggests relatively oxic depositional environment for the bedded cherts, under which regeneration of redox sensitive elements were not active.

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“…This suggests that Wakamarina Quartzite was not a chert, where the high silica content is diagenetically derived from the host sediments (Murray et al 1992b). Comparative correlation coefficients (r) between the chemical compositions of DSDP and ODP cherts and Wakamarina Quartzite are sufficiently different to support a dominantly terrigenous detrital origin, with some hydrogenous precipitation, for Wakamarina Quartzite.…”

Section: The δmentioning

confidence: 99%

“…However, the standard deviations of the three chert average analyses are generally large, such that direct comparison is equivocal. Murray et al (1992b) demonstrated that DSDP and nearshore cherts had Si/Al ratios far higher than their enclosing host sediments, reflecting the addition of SiO2 during diagenetic differentiation of the chert. Si/Al values for DSDP and ODP cherts representing pelagic to continental margin deposition (Murray et al 1992a) are (n = 36) mean 86 ± 83, range 6-273, median 46, whereas values for nearshore chert are (n = 9) mean 939 ± 1405, range 85 to >4400, median 181.…”

Section: Wakamarina Quartzitementioning

confidence: 99%

Wakamarina Quartzite and associated mafic rocks of Pelorus Group, Marlborough: Geochemistry and origins

Skinner

Brathwaite²

2002

New Zealand Journal of Geology and Geophysics

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Wakamarina Quartzite is a formation of the late Paleozoic to early Mesozoic Pelorus Group within the Jurassic metamorphosed Marlborough Schist of South Island, New Zealand. Pelorus Group is geochemically analogous to the type Caples Terrane of Otago, with a predominantly oceanic evolved arc-derived detrital geochemistry and a possible component derived from a continental margin arc. Wakamarina Quartzite is interlayered with metabasites and has a detrital input similar to the enclosing Pelorus Group semischists.Previously described as a "meta-chert", Wakamarina Quartzite has an oxygen isotope range and trace, major and light REE element ratios that indicate that it is more likely to have been a continental margin, clastic quartzose sediment, and that it had no detrital input from the associated metabasites. These have predominantly N-MORB geochemical abundances with a suggestion of an arc influence. Although the geochemistry of Wakamarina Quartzite indicates a predominantly terrigenous, mixed basalt-andesite and more evolved calc-alkaline arc source for the detrital input, some components may have been derived from spreading ridge hydrothermal activity and from direct hydrogenous precipitation. Some enhanced metallic elements (Ni, Cu, Zn) appear related to the scavenging influence of hydrothermal Fe, whereas Mn and Ba are predominantly of hydrogenous/authigenic origin.

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Rare earth, major, and trace element composition of Monterey and DSDP chert and associated host sediment: Assessing the influence of chemical fractionation during diagenesis

Cited by 107 publications

References 41 publications

Mesozoic radiolarian chert from the middle sector of the Yarlung Zangbo suture zone, Tibet and its tectonic implications

Mesozoic radiolarian chert from the middle sector of the Yarlung Zangbo suture zone, Tibet and its tectonic implications

Biogeochemical signatures preserved in ancient siliceous sediments; new perspectives to Triassic radiolarian bedded chert compositions

Wakamarina Quartzite and associated mafic rocks of Pelorus Group, Marlborough: Geochemistry and origins

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