Leg : 70 Top/Bottom Interval(mm): 1000/1020 Describer: Laverne, C. Hole: 510 Top of Core Depth(m) : 111.50 Rock Type: IGNEOUS Core: 8 Sample Midpoint(m) : 114.01 Sect/Pc #: 2/PCE 48 ROCK = PLAG-OL PHYRIC BASALT; Texture: MOD PHYRIC,MEDIUM-GRAINED,INTERSERTAL- HYALO-OPHITIC GLASS PHASE SHOWS QUENCHED TEXTURE; Where sampled: FLOW INTERIOR* Phenocrysts- OLIVINE ( 1%) Size(mm): .4X.4 Morphology: EUHEDRAL ALTERED; PLAGIOCLASE ( 12%) Size(mm): 5X3 Morphology: EUHEDRAL Groundmass - PLAGIOCLASE ( 30%) Size(mm): .4X.008 Morphology: MICROLITES CLINOPYROXENE ( 10%) Size(mm): .04 Morphology: ANHEDRAL MAGNETITE ( 7%) Size(mm): <.008 Morphology: SKELETAL PLAGIOCLASE+PYROXENE ( 40%) Size(mm): <.008 SHEAF-LIKE CLUSTERS OF XTLS(DUE TO QUENCHING)* Alteration - SMECTITE GREEN AND BROWN; IDDINGSITE Replacing: OL TALC Replacing: OL ID UNCERTAIN FOR TALC* Leg : 70 Top/Bottom Interval(mm): 1040/1060 Describer: Schrader, E.L. Hole: 510 Top of Core Depth(m) : 111.50 Rock Type: IGNEOUS Core: 8 Sample Midpoint(m) : 114.05 Sect/Pc #: 2/PCE 48 ROCK = PLAG-OL PHYRIC BASALT; Texture: PHYRIC,HYALOPILITIC* Phenocrysts- OLIVINE ( 1-2%) Size(mm): .2X.2 ALTERED TO TALC-IDDINGSITE(?); PLAGIOCLASE ( 7-10%) Morphology: BLOCKY-EUHEDRAL SIZE .6X.4-1.2X.8MM,OCCUR AS AGGREGATES* Groundmass - PLAGIOCLASE (20-25%) Size(mm): .36X.05 Morphology: SKELETAL LATHS MAGNETITE ( 8%) Morphology: SKELETAL GLASS ( 60%) QUENCHED GLASS REPRESENTED BY PLUMOSE PLAG-CPX; PYRITE ( 3%) SECONDARY VEINS AND GRAINS* Alteration - SMECTITE ( 8-10%) Location: VOIDS+ Replacing: GLASS Location: SCATTERED OFTEN WITH PYRITES; TALC ( 1-2%) Replacing: OL TALC-IDDINGSITE,PSEUDOMORPHS AFTER OL* Vesicles - Size(mm): 0 Leg : 70 Top/Bottom Interval(mm): 140/ 160 Describer: Laverne, C. Hole: 510 Top of Core Depth(m) : 111.50 Rock Type: IGNEOUS Core: 8 Sample Midpoint(m) : 114.33 Sect/Pc #: CC/PCE 51 ROCK = PLAG MOD PHYRIC BASALT; Texture: HYALO-OPHITIC-HYALOPILITIC; Where sampled: FLOW INTERIOR* Phenocrysts- PLAGIOCLASE ( 7%) Size(mm): 1.2X.8 Morphology: EUHEDRAL Groundmass - OLIVINE ( 6%) Size(mm): .12X.01 Morphology: SUBHEDRAL FRESH OR COMPLETELY ALTERED; PLAGIOCLASE ( 20%) Size(mm): .25X.01 Morphology: MICROLITES MAGNETITE ( 3%) Size(mm): <.008 Morphology: SKELETAL CLINOPYROXENE+PLAGIOCLASE ( 55%) MATURE SHEAF TEXTURE* Alteration - IDDINGSITE ( 3%) Replacing: OL IDDINGSITE+FE-OXIDES* Vesicles - Percent: 3 Location: GATHERED IN Filling: SMEC Shape: IRREGULAR Location: SOME AREAS Leg : 70 Top/Bottom Interval(mm): 500/ 520 Describer: Schrader, E.L. Hole: 510 Top of Core Depth(m) : 114.50 Rock Type: IGNEOUS Core: 9 Sample Midpoint(m) : 115.01 Sect/Pc #: 1/PCE 58 ROCK = PLAG-OL MOD PHYRIC BASALT; Texture: MOD PHYRIC,VARIOLITIC-HYALOPILITIC; Where sampled: NEXT TO GLASSY MARGIN* Phenocrysts- OLIVINE ( <1%) Size(mm): .5X.5 Morphology: SUBHEDRAL OCCUR WITH PLAG IN AGGREGATES,PLUCKED OUT; PLAGIOCLASE ( 2-4%) Size(mm): 1X2 Morphology: LATHS OCCUR AS AGGREGATES* Groundmass - OLIVINE ( 3-4%) Size(mm): .06X.06 Morphology: ANHEDRAL PLAGIOCLASE ( 10%) Size(mm): .6X.08 Morphology: SKELETAL LATHS CLINOPYROXENE ( 3-4%) Size(mm): .02X.02 Morphology: ANHEDRAL OL,PLAG AND CPX MAY OCCUR AS INDIVIDUAL XTLS OR AS GLOMEROCRYSTS; MAGNETITE ( 3-4%) Morphology: SKELETAL GLASS ( 75%) SEEN AS VARIOLITES AND MICROLITES* Alteration - PYRITE ( 1%) Location: SCATTERED Replacing: GLASS+MAGN ANHEDRA-SUBHEDRA* Vesicles - Size(mm): .3 Percent: 2 Leg : 70 Top/Bottom Interval(mm): 760/ 790 Describer: Laverne, C. Hole: 510 Top of Core Depth(m) : 114.50 Rock Type: IGNEOUS Core: 9 Sample Midpoint(m) : 115.28 Sect/Pc #: 1/PCE 61 ROCK = PLAG PHYRIC BASALT; Texture: PHYRIC,MEDIUM-GRAINED,HYALOPILITIC; Where sampled: FLOW INTERIOR* Phenocrysts- PLAGIOCLASE ( 20%) Size(mm): 2X1 Morphology: EUHEDRAL Groundmass - OLIVINE ( 7%) Size(mm): .08X.08 Morphology: EUHEDRAL-SUBHEDRAL ID UNCERTAIN FOR OL,TOTALLY ALTERED BY A PALE BROWN CLAY; PLAGIOCLASE ( 20%) Size(mm): .25X.15 Morphology: MICROLITES CLINOPYROXENE ( 2%) Size(mm): .04 Morphology: ANHEDRAL INTERSTITIAL TO PLAG; MAGNETITE ( 5%) Size(mm): .01 Morphology: SKELETAL PYROXENE+PLAGIOCLASE ( 45%) Size(mm): <.008 SHEAF-LIKE CLUSTERS OF XTLS(IMMATURE VARIOLITIC TEXTURE)* Alteration - CLAY MINERALS Replacing: OL PALE BROWN* Leg : 70 Top/Bottom Interval(mm): 1220/1250 Describer: Laverne, C. Hole: 510 Top of Core Depth(m) : 114.50 Rock Type: IGNEOUS Core: 9 Sample Midpoint(m) : 115.74 Sect/Pc #: 1/PCE 67 ROCK = PLAG MOD PHYRIC BASALT; Texture: MEDIUM-GRAINED,MOD PHYRIC,HYALOPILITIC, SUBOPHITIC JUXTAPOSITION OF HYALOPILITIC AND SUBOPHITIC AREAS; Where sampled: FLOW INTERIOR* Phenocrysts- PLAGIOCLASE ( 7%) Morphology: EUHEDRAL 2 SIZES-1X.5 AND .5X.2MM* Groundmass - OLIVINE ( 6%) Size(mm): .16X.1 Morphology: ANHEDRAL-SUBHEDRAL FRESH; PLAGIOCLASE ( 35%) Size(mm): .4X.01 Morphology: MICROLITES CLINOPYROXENE ( 3%) Size(mm): .1X.005 Morphology: ANHEDRAL MAGNETITE ( 4%) Size(mm): .01 Morphology: SKELETAL GLASS ( 45%) MATURE SHEAF TEXTURE* Leg : 70 Top/Bottom Interval(mm): 520/ 550 Describer: Laverne, C. Hole: 510 Top of Core Depth(m) : 114.50 Rock Type: IGNEOUS Core: 9 Sample Midpoint(m) : 116.54 Sect/Pc #: 2/PCE 78 ROCK = PLAG PHYRIC BASALT; Texture: MEDIUM-GRAINED,PHYRIC,HYALO-OPHITIC; Where sampled: FLOW INTERIOR* Phenocrysts- PLAGIOCLASE ( 12%) Size(mm): 2.0X.8 Morphology: EUHEDRAL Groundmass - OLIVINE ( 8%) Size(mm): .12X.12 Morphology: EUHEDRAL COMPLETELY ALTERED; PLAGIOCLASE ( 22%) Size(mm): .25X.01 Morphology: MICROLITES CLINOPYROXENE ( 3%) Size(mm): .04X.02 Morphology: ANHEDRAL INTERSTITIAL TO PLAG; MAGNETITE ( 5%) Size(mm): <.008 Morphology: SKELETAL GLASS ( 50%) MATURE SHEAF TEXTURE* Alteration - TALC ( 8%) Replacing: OL TALC+IDDINGSITE?; SMECTITE ( 2%) Location: CRACKS OR Location: NEAR OL Leg : 70 Top/Bottom Interval(mm): 800/ 830 Describer: Schrader, E.L. Hole: 510 Top of Core Depth(m) : 114.50 Rock Type: IGNEOUS Core: 9 Sample Midpoint(m) : 116.82 Sect/Pc #: 2/PCE 83 ROCK = PLAG-OL PHYRIC BASALT; Texture: PHYRIC,HYALOPILITIC; Where sampled: NEXT TO GLASSY MARGIN* Phenocrysts- OLIVINE ( 1%) Size(mm): .18X.2 Morphology: SUBHEDRAL ALTERED TO TALC+IDDINGSITE; PLAGIOCLASE ( 10%) Morphology: BLOCKY-LATHY SIZE .8X.7-1.5X1.2MM* Groundmass - PLAGIOCLASE ( 30%) Size(mm): .7X.08 Morphology: SKELETAL LATHS MAGNETITE ( 7%) Size(mm): .005-.01 Morphology: SKELETAL GLASS ( 50%) GLASS REPRESENTED BY PLUMOSE PLAG-CPX GROUPS* Alteration - TALC Replacing: OL TALC-IDDINGSITE(?),PSEUDOMORPHS AFTER OL; CLAY MINERALS ( 10%) Location: VOIDS+VEINS+ Replacing: GLASS Location: SCATTERED FERROUS OXIDE ( 1%) Location: SMEC VEINS Vesicles - Percent: 0 Leg : 70 Top/Bottom Interval(mm): 1200/1230 Describer: Laverne, C. Hole: 510 Top of Core Depth(m) : 114.50 Rock Type: IGNEOUS Core: 9 Sample Midpoint(m) : 117.22 Sect/Pc #: 2/PCE 87 ROCK = PLAG-OL MOD PHYRIC BASALT; Texture: MOD PHYRIC,MEDIUM-GRAINED,HYALO-OPHITIC; Where sampled: FLOW INTERIOR* Phenocrysts- OLIVINE ( 1%) Size(mm): .7X.3 Morphology: EUHEDRAL COMPLETELY ALTERED; PLAGIOCLASE ( 7%) Size(mm): .7X.25 Morphology: EUHEDRAL Groundmass - OLIVINE ( 6%) Size(mm): .15X.10 Morphology: SUBHEDRAL COMPLETELY ALTERED; PLAGIOCLASE ( 30%) Size(mm): .32X.01 Morphology: MICROLITES CLINOPYROXENE ( 2%) Size(mm): .025X.01 Morphology: ANHEDRAL MAGNETITE ( 4%) Size(mm): <.008 Morphology: SKELETAL GLASS ( 55%) MATURE SHEAF TEXTURE* Alteration - SMECTITE Location: CRACKS Replacing: GLASS IDDINGSITE ( 7%) Replacing: OL IDDINGSITE+FE-HYDROXIDES* Vesicles - Size(mm): .01 Percent: 1 Location: SCATTERED Filling: GREEN SMEC Shape: IRREGULAR VOIDS,NOT VESICLES* Leg : 70 Top/Bottom Interval(mm): 390/ 420 Describer: Laverne, C. Hole: 510 Top of Core Depth(m) : 114.50 Rock Type: IGNEOUS Core: 9 Sample Midpoint(m) : 117.91 Sect/Pc #: 3/PCE 97 ROCK = PLAG MOD PHYRIC BASALT; Texture: MOD PHYRIC,MEDIUM-GRAINED,HYALO-OPHITIC- HYALOPILITIC; Where sampled: FLOW INTERIOR* Phenocrysts- PLAGIOCLASE ( 7%) Size(mm): 1.2X.6 Morphology: EUHEDRAL Groundmass - OLIVINE ( 3%) Size(mm): .2X.05 Morphology: SUBHEDRAL PLAGIOCLASE ( 20%) Size(mm): .8X.008 Morphology: MICROLITES MAGNETITE ( 4%) Size(mm): <.008 Morphology: SKELETAL PLAGIOCLASE+PYROXENE ( 64%) Size(mm): <.008 SHEAF-LIKE CLUSTERS OF XTLS(DUE TO QUENCHING)* Alteration - SMECTITE ( 1%) Location: SCATTERED Replacing: GLASS IN AREAS <.008MM; IDDINGSITE ( 1%) Location: NEAR OR IN Location: CRACKS OF OL Location: XTLS ID UNCERTAIN FOR IDDINGSITE* Leg : 70 Top/Bottom Interval(mm): 530/ 590 Describer: Schrader, E.L. Hole: 510 Top of Core Depth(m) : 114.50 Rock Type: IGNEOUS Core: 9 Sample Midpoint(m) : 118.06 Sect/Pc #: 3/PCE 100 ROCK = PLAG-OL PHYRIC BASALT; Texture: PHYRIC,VARIOLITIC; Where sampled: GLASSY MARGIN* Phenocrysts- OLIVINE ( <<1%) Size(mm): .24X.24 Morphology: EUHEDRAL PLAGIOCLASE ( 8-10%) Size(mm): 1.3X.70 Morphology: BLOCKY EUHEDRAL IN AGGREGATES* Groundmass - OLIVINE ( 3-5%) Size(mm): .06X.06 Morphology: EUHEDRAL PLAGIOCLASE ( 7-10%) Size(mm): .36X.02 Morphology: ACICULAR MAGNETITE ( 3-4%) Morphology: SKELETAL GLASS ( 70%) REPRESENTED BY VARIOLITES* Vesicles - Size(mm): 0 Leg : 70 Top/Bottom Interval(mm): 40/ 60 Describer: Schrader, E.L. Hole: 510 Top of Core Depth(m) : 123.00 Rock Type: IGNEOUS Core: 10 Sample Midpoint(m) : 123.05 Sect/Pc #: 1/PCE 107 ROCK = PLAG-OL MOD PHYRIC BASALT; Texture: MOD PHYRIC,HYALOPILITIC-VARIOLITIC; Where sampled: NEXT TO GLASSY MARGIN* Phenocrysts- OLIVINE ( <<1%) Size(mm): .4X.4 Morphology: ANHEDRAL OFTEN IN AGGREGATES OF PLAG; PLAGIOCLASE ( 2%) Size(mm): .6X.15 Morphology: LATHS OFTEN IN AGGREGATES* Groundmass - OLIVINE ( 5%) Size(mm): .06X.06 Morphology: ANHEDRAL PLAGIOCLASE ( 15%) Size(mm): .36X.06 Morphology: SKELETAL LATHS CLINOPYROXENE ( 5%) Size(mm): .04X.04 Morphology: ANHEDRAL MAGNETITE ( 5-8%) Morphology: SKELETAL GLASS ( 70%) SEEN AS MATURE SHEAFS AND PLUMOSE CPX,PLAG AND OL* Alteration - PYRITE ( 3-5%) Location: VEIN+GNDMASS Replacing: MAGN+GLASS ANHEDRAL* Vesicles - Size(mm): .5 Percent: 1 Filling: EMPTY Shape: OVOID Leg : 70 Top/Bottom Interval(mm): 140/ 180 Describer: Schrader, E.L. Hole: 510 Top of Core Depth(m) : 123.00 Rock Type: IGNEOUS Core: 10 Sample Midpoint(m) : 123.16 Sect/Pc #: 1/PCE 108 ROCK = PLAG-OL MOD PHYRIC BASALT; Texture: MOD PHYRIC,VARIOLITIC; Where sampled: GLASSY MARGIN* Phenocrysts- OLIVINE ( <<1%) Size(mm): .3X.2 Morphology: SUBHEDRAL SOME ALTERED,MOST FRESH; PLAGIOCLASE ( 4-7%) Size(mm): .6X.12 Morphology: SUBEQUANT-EUHEDRAL LATHS Groundmass - OLIVINE ( 5-8%) Size(mm): .1X.1 Morphology: SKELETAL-BLOCKY PLAGIOCLASE ( 8-10%) Size(mm): .36X.08 Morphology: SKELETAL LATHS MAGNETITE ( 5%) Size(mm): .012 Morphology: SKELETAL GLASS (70-80%) REPRESENTED BY VARIOLITES-SOME MORE COARSELY XTLLINE THAN OTHERS,CPX+PLAG VARIOLITES* Alteration - OLIVINE ( <<1%) Location: OL PHENOS INCIPIENT ALTERATION OF OL* Vesicles - Percent: 0 Leg : 70 Top/Bottom Interval(mm): 730/ 750 Describer: Laverne, C. Hole: 510 Top of Core Depth(m) : 123.00 Rock Type: IGNEOUS Core: 10 Sample Midpoint(m) : 123.74 Sect/Pc #: 1/PCE 115 ROCK = PLAG MOD PHYRIC BASALT; Texture: MOD PHYRIC,MEDIUM-GRAINED,INTERSERTAL WITH SOME AREAS OF SHEAF-LIKE INTERGROWTHS OF CPX AND PLAG; Where sampled: FLOW INTERIOR* Phenocrysts- PLAGIOCLASE ( 7%) Size(mm): .8X.5 Morphology: EUHEDRAL OR SUBHEDRAL LATHS Groundmass - OLIVINE ( 3%) Morphology: SUBHEDRAL PLAGIOCLASE ( 40%) Size(mm): .3X.008 Morphology: MICROLITES CLINOPYROXENE ( 27%) Size(mm): .08X.04 Morphology: ANHEDRAL MAGNETITE ( 3%) Size(mm): <.005 Morphology: SKELETAL PLAGIOCLASE+PYROXENE ( 20%) VERY SMALL XTLS DUE TO QUENCHING* Alteration - CALCITE ( 1%) SMECTITE (10-15%) Location: SCATTERED Replacing: GLASS+FILLING VOIDS ID UNCERTAIN FOR BROWN SMEC* Leg : 70 Top/Bottom Interval(mm): 360/ 390 Describer: Laverne, C. Hole: 510 Top of Core Depth(m) : 128.00 Rock Type: IGNEOUS Core: 11 Sample Midpoint(m) : 128.38 Sect/Pc #: 1/PCE 123 ROCK = PLAG PHYRIC BASALT; Texture: PHYRIC,FINE-GRAINED,SUBGLOMEROPHYRIC, HYALOPILITIC GROUNDMASS IS HYALOPILITIC; Where sampled: NEXT TO GLASSY MARGIN* Phenocrysts- PLAGIOCLASE ( 10%) Size(mm): .8X.4 Morphology: EUHEDRAL Groundmass - OLIVINE ( 7%) Size(mm): .15X.08 Morphology: SUBHEDRAL PLAGIOCLASE ( 5%) Size(mm): .24X.05 Morphology: MICROLITES CLINOPYROXENE ( 5%) Size(mm): .15X.08 Morphology: EUHEDRAL CLUSTERS OF OL+PLAG+CPX,SOME PLAG AND OL XTLS ARE ALSO SCATTERED IN THE GROUNDMASS; MAGNETITE ( 3%) Size(mm): <.008 Morphology: SKELETAL GLASS ( 60%) IMMATURE VARIOLITIC TEXTURE; PLAGIOCLASE ( 7%) Size(mm): .16X.002 Morphology: MICROLITES NOT EQUAL TO SIZE OF MICROLITES DESCRIBED ABOVE* Alteration - SMECTITE ( 3%) Location: CRACKS Replacing: GLASS+PARTLY OL Leg : 70 Top/Bottom Interval(mm): 400/ 430 Describer: Laverne, C. Hole: 510 Top of Core Depth(m) : 128.00 Rock Type: IGNEOUS Core: 11 Sample Midpoint(m) : 128.42 Sect/Pc #: 1/PCE 124 ROCK = PLAG PHYRIC BASALT WITH A GLASSY RIM THIS IS NOT THE DESCRIPTION OF THE GLASSY MARGIN; Texture: PHYRIC,FINE-GRAINED,GLOMEROPHYRIC,VARIOLITIC VARIOLITIC GROUNDMASS; Where sampled: NEXT TO GLASSY MARGIN* Phenocrysts- PLAGIOCLASE ( 10%) Size(mm): 2X.7 Morphology: EUHEDRAL Groundmass - OLIVINE ( 3%) Size(mm): .15X.1 Morphology: EUHEDRAL SCATTERED IN THE WHOLE ROCK; PLAGIOCLASE ( 7%) Size(mm): .4-.015 Morphology: MICROLITES CLINOPYROXENE ( 5%) Size(mm): .15X1A Morphology: NHEDRAL PLAG+CPX CLUSTERS; MAGNETITE ( 2%) Size(mm): <.004 Morphology: SKELETAL GLASS ( 73%) VARIOLITIC* Alteration - SMECTITE Location: CRACKS Replacing: OL IDDINGSITE Replacing: OL IDDINGSITE,TALC?* Leg : 70 Top/Bottom Interval(mm): 980/1000 Describer: Laverne, C. Hole: 510 Top of Core Depth(m) : 128.00 Rock Type: IGNEOUS Core: 11 Sample Midpoint(m) : 128.99 Sect/Pc #: 1/PCE 133 ROCK = PLAG MOD PHYRIC BASALT; Texture: MOD PHYRIC,MEDIUM-GRAINED,INTERSERTAL WITH SOME AREAS OF SHEAF-LIKE INTERGROWTHS OF CPX AND PLAG; Where sampled: FLOW INTERIOR* Phenocrysts- PLAGIOCLASE ( 8%) Size(mm): 1.5X1 Morphology: EUHEDRAL TWINNED Groundmass - PLAGIOCLASE ( 36%) Size(mm): .3X.008 Morphology: MICROLITES CLINOPYROXENE+PLAGIOCLASE ( 50%) Size(mm): <.008 IN SHEAF-LIKE INTERGROWTHS; MAGNETITE ( 3-4%) Size(mm): .01 Morphology: SKELETAL Alteration - CLAY MINERALS ( 2%) Location: VOIDS Replacing: OL COLORLESS OR PALE BROWN,EUHEDRAL XTLS,OL(?)* Vesicles - Percent: 2 Filling: COLORLESS+BROWN Shape: IRREGULAR Filling: CLAY VOIDS,NOT VESICLES* Leg : 70 Top/Bottom Interval(mm): 980/1000 Describer: Schrader, E.L. Hole: 510 Top of Core Depth(m) : 128.00 Rock Type: IGNEOUS Core: 11 Sample Midpoint(m) : 128.99 Sect/Pc #: 1/PCE 133 ROCK = PLAG-OL PHYRIC BASALT; Texture: PHYRIC,HYALOPILITIC-VARIOLITIC; Where sampled: NEXT TO GLASSY MARGIN* Phenocrysts- OLIVINE ( 5%) Size(mm): .24X.24 Morphology: ROUNDED-EUHEDRAL SOME ALTERED; PLAGIOCLASE ( 5%) Size(mm): 1.7X1.2 Morphology: BLOCKY OL+PLAG OFTEN OCCUR IN AGGREGATES* Groundmass - OLIVINE ( 5%) Size(mm): .05X.05 Morphology: BLOCKY PLAGIOCLASE ( 20%) Size(mm): .08X.7 Morphology: SKELETAL-ACICULAR MAGNETITE ( 5%) ILMENITE ( 60%) REPRESENTED BY SHEAFS OF CPX+PLAG* Alteration - IDDINGSITE ( <1%) Location: OL PHENOS Replacing: OL IDDINGISTE-TALC; SMECTITE ( 8-10%) Location: VOIDS+SOME Replacing: GLASS Location: VEINS+ Location: SCATTERED |
Cite as: Deep Sea Drilling Project (1989): Archive of Core and Site/Hole Data and Photographs from the Deep Sea Drilling Project (DSDP). National Geophysical Data Center, NOAA. doi:10.7289/V54M92G2 [access date]
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