Some additional potassium-argon ages of hawaiian rocks: The Maui volcanic complex of Molokai, Maui, Lanai and Kahoolawe

Naughton, John; Macdonald, Gordon A.; Greenberg, V.A.

doi:10.1016/0377-0273(80)90037-2

Cited by 52 publications

(28 citation statements)

References 18 publications

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“…Furthermore, Hoernle et al (2002) Naughton et al 1980). This is followed in age progression by Molokai (676 km 2 ) dated between 1.75 and 1.9 Ma (Naughton et al 1980), Oahu (1574 km 2 ) dated between 2.6 and 3.7 Ma (Doell & Dalrymple 1973) and Kauai (1433 km 2 ) dated at 5.1 Ma (McDougall 1979). The coastline of all the islands sums to a length of 1207 km (University of Hawaii 1973).…”

Section: K1mentioning

confidence: 99%

The age and origin of the Pacific islands: a geological overview

Neall

Trewick

2008

Phil. Trans. R. Soc. B

289

237

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The Pacific Ocean evolved from the Panthalassic Ocean that was first formed ca 750 Ma with the rifting apart of Rodinia. By 160 Ma, the first ocean floor ascribed to the current Pacific plate was produced to the west of a spreading centre in the central Pacific, ultimately growing to become the largest oceanic plate on the Earth. The current Nazca, Cocos and Juan de Fuca (Gorda) plates were initially one plate, produced to the east of the original spreading centre before becoming split into three. The islands of the Pacific have originated as: linear chains of volcanic islands on the above plates either by mantle plume or propagating fracture origin, atolls, uplifted coralline reefs, fragments of continental crust, obducted portions of adjoining lithospheric plates and islands resulting from subduction along convergent plate margins. Out of the 11 linear volcanic chains identified, each is briefly described and its history summarized. The geology of 10 exemplar archipelagos ( Japan, Izu-Bonin, Palau, Solomons, Fiji, New Caledonia, New Zealand, Society, Galápagos and Hawaii) is then discussed in detail.

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Section: K1mentioning

confidence: 99%

The age and origin of the Pacific islands: a geological overview

Neall

Trewick

2008

Phil. Trans. R. Soc. B

289

237

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“…Macdonald and Katsura, 1964;Macdonald and Powers, 1968) and on East Molokai (e.g. Naughton et al, 1980). Sisson et al (2009) reported basanite-nephelinite glass compositions from the submarine Hilina bench (Kilauea) that form a negative slope fractionation trend in the TAS diagram (Fig.…”

Section: Carbonatites On Hawaii?mentioning

confidence: 99%

Carbonatites in oceanic hotspots

Schmidt¹,

Weidendorfer

2018

Geology

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SUPPLEMENTARY MATERIAL METHODSData were compiled from the pre-sorted georoc database ocean island files (http://georoc.mpchmainz.gwdg.de/georoc/). Hot spots such as Aetna or Samoa with geotectonically complex situations and possible direct interference with subduction were avoided; otherwise we used those with sufficiently large data sets. Each file was filtered for analyses with 95-101.5 wt% totals, samples outside this range or listed as altered were excluded. All bulk rock compositions are then normalized to 100 wt% total on a volatile free basis with all Fe as FeO.The histogram of total alkalis for extrusives shows a clear cut-off to <1.4 wt% K 2 O+Na 2 O. Of e.g. 9'000 extrusives of the Hawaiian hotspot only 24 are below this values, these are essentially from three publications (without geographical coherence), suggesting that these rocks were altered or possibly have an analytical problem; this is corroborated by a K 2 O/Na 2 O ranging from 0.01 to 2 for these 24 samples. We have hence excluded all rocks with <1.4 wt% Na 2 O+K 2 O. Similarly, we did not accept trace element concentrations measured by XRF that are below 5-15 ppm (depending on the element).Within each ocean island, rocks were sorted for (i) Those with X Mg >0.77 and/or Ni>650 ppm, this group is mostly olivine cumulative and was excluded from all plots. (ii) Primitive melts were designated when X Mg =0.77-0.65, which corresponds to equilibrium with olivine of Fo 92-88 at 5-15 mol% Fe 3+ (of Fe tot ), and Ni=150-650 ppm, corresponding to roughly 2000-4500 ppm Ni in mantle olivine (note that the K D olivine/melt of Ni strongly depends on temperature, hence this range is chosen rather large). (iii) To enlarge the dataset, rocks with 0.55100 analyses were retained, the dataset sorted for the above criteria contains 124-198 analyses for Pitcairn, Ascension, St. Helena and Tristan da Cunha; 242-331 for GSA Data Repository 2018136

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“…Alkalic flows are present only locally atop the tholeiitic sequence (Macdonald et al, 1983). Potassium-argon dates of postshield alkalic basalts suggest that the island is around 1 million years old (Naughton et al, 1980). The average magnetite and ilmenite content of the tholeiitic and alkali olivine basalts, characteristic for Kaho'olawe lies between 37-46 and 24-50 g/kg (Wedepohl, 1969).…”

Section: Geology and Geomorphologymentioning

confidence: 99%

Improving UXO Detection and Discrimination in Magnetic Environments

Li¹,

Krahenbuhl²,

Meglich³

et al. 2010

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Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. for improved modeling of geophysical data in these environments. Lastly, through our field work we have discovered that sites previously thought to be benign may exhibit weak viscous remanent magnetization. Thus the field activities from this project have broad implications for ongoing and future remediation efforts in similar environments within the continental US. 3On another research front, we have utilized the information gathered from our field and laboratories activities to develop robust forward modeling algorithms and material on filter analysis of TDEM data in the presence of magnetic geologic noise. For example, we present a method for simulating the background response of strong magnetic environments on EM data using correlated random numbers. We show how these simulated responses may prove viable for discrimination of UXO in these magnetic terrains.Finally, we demonstrate new sets of procedures for improved target detection and decreased false positives in strongly magnetic environments based on the magnetic method. This includes development and implementation of iterative Wiener and wavelet based filter approaches for separating the response of magnetic geology from those of UXO. In addition, we demonstrate successful implementation of a high-pass Butterworth filter originally applied during decorrugation of unleveled magnetic data for the same purpose.4

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Some additional potassium-argon ages of hawaiian rocks: The Maui volcanic complex of Molokai, Maui, Lanai and Kahoolawe

Cited by 52 publications

References 18 publications

The age and origin of the Pacific islands: a geological overview

The age and origin of the Pacific islands: a geological overview

Carbonatites in oceanic hotspots

Improving UXO Detection and Discrimination in Magnetic Environments

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