FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2047488732> ?p ?o ?g. }

• W2047488732 endingPage "113" @default.
• W2047488732 startingPage "97" @default.
• W2047488732 abstract "Crystallisation-age spectra have been obtained by SIMS techniques (SHRIMP-RG) on zircons from altered volcanic units penetrated by drillholes at Kawerau Geothermal Field in the central Taupo Volcanic Zone (TVZ), New Zealand. Drillholes penetrate 700–1300 m of volcanic rocks and sediments before reaching the basement Mesozoic greywacke. Twenty-seven samples of altered volcanic lithologies and two surficial, fresh rock units have been studied in order to constrain ages of the major stratigraphic units. Within the volcanic/sedimentary pile the oldest in-situ ignimbrites that can be widely correlated have ages of ~ 1.45 Ma. Between them and the basement greywacke is a variable thickness of sediments, mostly greywacke gravels and minor volcaniclastic units, reflecting localised basinal deposition associated with strike–slip faulting. Two ignimbrites within this sequence yield age estimates of c. 2.4 and 2.1 Ma, consistent with these being distal southern Coromandel Volcanic Zone deposits, pre-dating TVZ activity. Below the regional marker plane of the 0.32 Ma Matahina ignimbrite, three main ignimbrite groups occur, with ages around 1.45 Ma, 1.0 Ma and 0.6–0.5 Ma, which are separated by sediment-dominated intervals and andesite volcanics. All of these ignimbrites represent marker horizons from other volcanic centres and do not reflect the presence of local magmatic heat sources. Numerous bodies of coherent rhyolite, previous labelled as Caxton and Onepu rhyolites, have been intersected at all pre-Matahina ignimbrite levels (including within the basement greywacke) and reflect earlier local magmatic heat sources. Our geochronological data resolve these rock bodies into three packages. The youngest is represented by the surficial rhyodacite Onepu domes, 40Ar/39Ar dated at 0.138 ± 0.007 Ma. U–Pb ages on zircons from dome material yield a spectrum that can be matched (consistent with petrography) with two dikes intersected at 880 m and 2.67 km depth, and with an estimated age of 0.15 ± 0.01 Ma (Onepu Formation). The older two packages consist of older crystal rich (~ 15%) and younger crystal-poor (~ 5%) rhyolite, here grouped as Caxton Formation and with eruption/intrusion age of 0.36 ± 0.03 Ma. The shallowest Caxton rhyolite bodies are interpreted to be domes, whilst deeper intersections are inferred to be sills based on the lateral extents relative to thicknesses. Net subsidence rates inferred from depths to key units do not reflect the present-day situation. Modern rates of subsidence (2 ± 1 mm/yr) associated with TVZ rifting processes can have been active for no more than ~ 50,000 years, based on elevation differences of the Matahina ignimbrite top surface. An inferred change in intrusion geometry from sill (Caxton) to dike (Onepu) indicates a change in principal stress orientations reflecting onset of the modern Whakatane Graben. This change is dated at ~ 0.37 Ma in coastal sedimentary sequences 23 km to the north of Kawerau, consistent with our age data. Although previously interpreted to be a long-lived system, the modern Kawerau Geothermal Field is a Holocene entity reflecting the rejuvenation of magmatic heat flux associated with Putauaki volcano superimposed on an area of multiple reactivated fault structures, sporadic magmatism and variable rates of subsidence." @default.
• W2047488732 created "2016-06-24" @default.
• W2047488732 creator A5001131895 @default.
• W2047488732 creator A5006734306 @default.
• W2047488732 creator A5023451723 @default.
• W2047488732 creator A5047515258 @default.
• W2047488732 creator A5052592527 @default.
• W2047488732 creator A5067200603 @default.
• W2047488732 creator A5084743617 @default.
• W2047488732 date "2013-03-01" @default.
• W2047488732 modified "2023-09-26" @default.
• W2047488732 title "U–Pb dating of zircon in hydrothermally altered rocks of the Kawerau Geothermal Field, Taupo Volcanic Zone, New Zealand" @default.
• W2047488732 cites W1520664739 @default.
• W2047488732 cites W1967492609 @default.
• W2047488732 cites W1967736980 @default.
• W2047488732 cites W1989397170 @default.
• W2047488732 cites W1993070373 @default.
• W2047488732 cites W1993386199 @default.
• W2047488732 cites W1994997879 @default.
• W2047488732 cites W1997922501 @default.
• W2047488732 cites W2001328981 @default.
• W2047488732 cites W2001680486 @default.
• W2047488732 cites W2002586037 @default.
• W2047488732 cites W2003348849 @default.
• W2047488732 cites W2005894983 @default.
• W2047488732 cites W2007105153 @default.
• W2047488732 cites W2007391735 @default.
• W2047488732 cites W2009939327 @default.
• W2047488732 cites W2011524193 @default.
• W2047488732 cites W2013103456 @default.
• W2047488732 cites W2016338468 @default.
• W2047488732 cites W2025324534 @default.
• W2047488732 cites W2027252071 @default.
• W2047488732 cites W2030099477 @default.
• W2047488732 cites W2036174339 @default.
• W2047488732 cites W2040001318 @default.
• W2047488732 cites W2044998253 @default.
• W2047488732 cites W2050019121 @default.
• W2047488732 cites W2052643643 @default.
• W2047488732 cites W2059010589 @default.
• W2047488732 cites W2060688546 @default.
• W2047488732 cites W2064426995 @default.
• W2047488732 cites W2064642826 @default.
• W2047488732 cites W2069445430 @default.
• W2047488732 cites W2075013266 @default.
• W2047488732 cites W2078838424 @default.
• W2047488732 cites W2087024817 @default.
• W2047488732 cites W2087081812 @default.
• W2047488732 cites W2089594811 @default.
• W2047488732 cites W2091343085 @default.
• W2047488732 cites W2093369526 @default.
• W2047488732 cites W2093506546 @default.
• W2047488732 cites W2093710394 @default.
• W2047488732 cites W2114793138 @default.
• W2047488732 cites W2122798313 @default.
• W2047488732 cites W2123956134 @default.
• W2047488732 cites W2135781808 @default.
• W2047488732 cites W2153592355 @default.
• W2047488732 cites W2158100493 @default.
• W2047488732 cites W2164073782 @default.
• W2047488732 cites W2165041309 @default.
• W2047488732 cites W2314579706 @default.
• W2047488732 doi "https://doi.org/10.1016/j.jvolgeores.2012.12.016" @default.
• W2047488732 hasPublicationYear "2013" @default.
• W2047488732 type Work @default.
• W2047488732 sameAs 2047488732 @default.
• W2047488732 citedByCount "31" @default.
• W2047488732 countsByYear W20474887322013 @default.
• W2047488732 countsByYear W20474887322014 @default.
• W2047488732 countsByYear W20474887322015 @default.
• W2047488732 countsByYear W20474887322016 @default.
• W2047488732 countsByYear W20474887322017 @default.
• W2047488732 countsByYear W20474887322018 @default.
• W2047488732 countsByYear W20474887322019 @default.
• W2047488732 countsByYear W20474887322020 @default.
• W2047488732 countsByYear W20474887322021 @default.
• W2047488732 countsByYear W20474887322022 @default.
• W2047488732 countsByYear W20474887322023 @default.
• W2047488732 crossrefType "journal-article" @default.
• W2047488732 hasAuthorship W2047488732A5001131895 @default.
• W2047488732 hasAuthorship W2047488732A5006734306 @default.
• W2047488732 hasAuthorship W2047488732A5023451723 @default.
• W2047488732 hasAuthorship W2047488732A5047515258 @default.
• W2047488732 hasAuthorship W2047488732A5052592527 @default.
• W2047488732 hasAuthorship W2047488732A5067200603 @default.
• W2047488732 hasAuthorship W2047488732A5084743617 @default.
• W2047488732 hasConcept C120806208 @default.
• W2047488732 hasConcept C122792734 @default.
• W2047488732 hasConcept C127313418 @default.
• W2047488732 hasConcept C127413603 @default.
• W2047488732 hasConcept C147176958 @default.
• W2047488732 hasConcept C17409809 @default.
• W2047488732 hasConcept C192241223 @default.
• W2047488732 hasConcept C25822816 @default.
• W2047488732 hasConcept C2778849375 @default.
• W2047488732 hasConcept C2781297371 @default.
• W2047488732 hasConcept C36986328 @default.
• W2047488732 hasConcept C5900021 @default.

• next