Alaska Volcano Observatory - Chemical data from tertiary igneous rocks, Atka and Amlia Islands, Central Aleutian Arc, Alaska

CHEMICAL DATA FROM TERTIARY IGNEOUS ROCKS, ATKA AND AMLIA ISLANDS, CENTRAL ALEUTIAN ARC, ALASKA

Morgenson, L., Vallier, T. L., and Lamothe, P., 1985, Chemical data from tertiary igneous rocks, Atka and Amlia Islands, Central Aleutian Arc, Alaska: U.S. Geological Survey Open-File Report 85-0741, 28 p.

DATA TABLES *Not all tables in a publication may be listed. Not all tables from a publication have data entered in the database.

21: Rock names and analyses performed on igneous rocks from Amlia Island.

* Rocks are arranged by increasing SiO2 content and setting (1-4 are intrusives; 5-28 are flows). Analyses are P, petrography; X, x-ray spectroscopy; N, neutron activation; A, K-Ar age; S, Sr87/Sr86 isotopes; O, other chemistry (H2O, CO2, FeO). *

22: Rock names and analyses performed on igneous rocks from Atka Island.

23: Major minerals, primary and secondary, in igneous rocks from Amlia Island determined by thin section and x-ray diffraction (x) analyses.

* Order shows relative abundance as determined from thin section analysis. *

24: Major minerals, primary and secondary, in igneous rocks from Atka Island determined by thin section and x-ray diffraction (x) analyses.

* Order shows relative abundance as determined from thin section analysis. *

25: Major, minor, and trace oxide compositions of igneous rocks from Amila Island.

* All analyses performed at Menlo Park analytical lab. 10 major oxides + Ni and Sr analyzed on a Diano 8600 wavelength-dispersive sequential x-ray specrotrometer by L. Espos. FeO analyzed by wet chemistry, total iron by x-ray spectroscopy and Fe2O3 by difference. H2O+ and H2O- measured gravimetrically. Total carbon measured as CO2 using a LECO WR-12 carbon determinator. FeO, H2O+, H2O-, and CO2 analyzed by P. Klock. Rock types are form Friesen, 1981. Sample numbers correspond with those in tables 1 and 2. *

26: Major, minor, and trace oxide compositions of igneous rocks from Amila Island.

* 10 (super 1) major oxides analyzed in Denver on a Phillips PW 1600 wavelength-dispersive simultaneous x-ray spectrometer, J.S. Wahlberg, A. Bartel, and J. Baker, analysts. Ni and Sr analyzed in Menlo Park on a Diano 8600 wavelength-dispersive sequential x-ray spectrometer, and on a Kevex energy dispersive x-ray spectrometer. B. King, analyst. 10 (super 2) major oxides, + Ni and Sr analyzed in Menlo Park on a Diano 8600 wavelength-dispersive sequential x-ray spectrometer and on a Kevex energy dispersive x-ray spectrometer. L. Espos, analyst. For all samples FeO analyzed by wet chemistry, total iron by x-ray spectroscopy and Fe2O3 by difference. H2O+ and H2O- measured gravimetrically. Total carbon measured as CO2 using a LECO WR-12 carbon determinator. FeO, H2O+, and H2O- measured in Menlo Park, (super 1) M. Cremer and (super 2) M. Taylor analysts. Sample numbers correspond to those in tables 7 and 8. *

27: Statistics on in-house Baker Basalt Standard quality control sample counted 62 times over a 6-month period of time.

* Error limit is 1 sigma. First column is +/- the standard deviation. Second column shows relative error. X-ray project, Denver, Colorado analytical laboratory. *

28: X-ray spectroscopy results of U.S. Geological Survey standards QL0-1 (latite) and BCR-1 (basalt) run with samples in Menlo Park analytical lab.

* QLO-1 was analyzed for 10 major oxides. BCR-1 was analyzed for SrO and NiO. All analyses were performed on a Diano 8600 wavelength-dispersive simultaneous x-ray spectrometer. L. Espos and B. King, analysts. Reference values are from Flanagan, F.J., 1976, Descriptions and analyses of eight new U.S.G.S. rock standards: U.S. Geological Survey Prof. Paper 840, 192 p. *

29: Instrumental neutron activation analysis of igneous rocks from Amlia Island.

* All values are in ppm. Sigma is in % Error limits are one standard deviation based on counting statistics alone. Numbers in parentheses are numbers of individual results, based on repetitive counts, averaged to yield expressed results. "-" means not reported due to instrumental problems on the second LEPD count. Samples were irradiated at the Georgia Tech Research Reactor and were counted on a coaxial Ge(Li) detector and an intrinsic germanium planar low-energy photon detector. Data processing was carried out on a Honeywell series 60, level 68 computer that operates in the multics operating system. Samples were analyzed through Reston analytical lab, L.J., Schwartz, analyst. Sample numbers correspond with those in tables 1 and 2. *

30: Instrumental neutron activation analysis of igneous rocks from Atka Island.

* All values are in ppm. Cv is coefficient of variation and is in %, (CV= sigma/mean x 100). "<" means below empirical detection limit (usually due to unidentified interference). "*" means cv exceeds 30%; < value is 3X standard deviation of measured value. Sample numbers correspond with those in tables 7 and 8. Analysis performed in Denver analytical lab. (super 1) D. McKown and R. Knight, analysts. (super 2) J. Budahn and D. McKown, analysts. *

31: Rare earth element compositions of igneous rocks from Amlia Island, normalized for chondrites

* * from Haskin et al., 1968. AGV-1, U.S. Geological Survey standard andesite, used as control. Samples were irradiated at the Georgia Tech Research Reactor and counted on a coaxial Ge(Li) detector and an intrinsic germanium planar low-energy photon detector. Data processing was carried out on a Honeywell series 60, level 68 computer that operates in the multics operating system. Samples were analyzed through Reston analytical lab, L.J. Swchwartz, analyst. *

32: Trace element composition of igneous rocks from Amlia Island*.

* All results are in ppm. Other elements were scanned, but are below the limits of detection (listed in parentheses in ppm); Ag (4.0); As(200); Au(14); Be(1.4); 4 samples have detectable amounts of Be - 4 and 19, 1.4 ppm, 15, 1.8 ppm, and 24, 1.7 ppm; Bi(14); Cd(30); Mo (4); Nb (20); Sn (4); W (20); Ge (14); In (3); Re (14); Tl (6); Hg (20). "<" indicates limits of detection for a particular element. Sample numbers correspond to those in tables 1 and 2. Samples were analyzed using D-C arc direct reading optical emission spectroscopy, Menlo Park, analytical lab, C. Heropoulos, analyst. * determined by direct reading optical emission spectroscopy. *

33: Trace elements from Atka Island. All values are in ppm.

* Other elements were scanned but are below the limits of detection (listed in parentheses in ppm); Ag (0.2); As (150); Au (7); Bi (7); Cd (7); Mo (2); Nb (10); Pd (1); Pt (5); Sn (2); Te (300); W (10); Ge (7); In (1.5); Li (100); Re (7); Tl (3). "<" indicates limits of detection for a particular element. "N/A" means not analyzed. Sample numbers correspond to those in tables 7 and 8. All samples were analyzed at Menlo Park analytical lab. Samples analyzed by D.C. arc optical emission spectroscopy, R. Lerner and J. Kent, analysts. *