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Supplemental material: First bedrock samples dredged from submarine outcrops in the Chukchi Borderland, Arctic Ocean

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journal contribution
posted on 22.12.2014 by Kelley Brumley, Elizabeth L. Miller, Alexandros Konstantinou, Marty Grove, Kristian E. Meisling, Larry A. Mayer
Geosphere, February 2015, v. 11, p. 76-92, doi:10.1130/GES01044.1, Supplemental File - Tables A.1–A.9: Table A.1. Zircon U-Pb lead geochronologic data and apparent ages from Chukchi Borderland amphibolite samples 5-009 (IGSN ECS 008102), 5-043b (IGSN ECS 008136) (HLY0905-DS5 77.8136N, 161.3465W). “Preferred age” for samples under 1000 Ma is 207Pb corrected 206Pb/238U age. Table A.2. Zircon trace element abundances (ppm) for samples #5-019 (IGSN #ECS008044) and #5-009 (IGSN #ECS008102). Table A.3. Zircon U-Pb lead geochronologic data and apparent ages from Chukchi Borderland garnet-bearing mylonitic gneiss samples #5-019 (IGSN ECS #008044) and #5-020b (IGSN #ECS008045) (HLY0905-DS5 77.8136N, 161.3465W ). “Preferred age” for samples under 1000 Ma is the 207Pb corrected 206Pb/238U age. Analyses over 1000 Ma are 204Pb corrected 207Pb/206Pb ages. Sample 5-019 was mounted on two different mounts (KJB002 and ESG08) and run in two different sessions. Sample 5-020 was mounted on one zircon mount (KJB002) but run in two different sessions. Blue bars outline analyses from zircons with igneous trace element patterns, while non-colored regions correspond to zircons with metamorphic trace element patterns and morphology (see text for discussion). Notes on zircon morphology seen in CL images appear in the far right column. Table A.4. Zircon U-Pb geochronologic data and apparent ages from Chukchi Borderland orthogneiss samples 5-002a (IGSN ECS008095), 5-001b (IGSN ECS008094) (HLY0905-DS5 77.8136N, 161.3465W). Preferred age is 207Pb corrected 206Pb/238U age for samples under 1000 Ma and 204Pb corrected 207Pb/206Pb age for samples over 1000 Ma. Excluded analyses were not used in median age calculations but still appear as dotted ellipses on concordia diagrams (Fig. 3). Areas highlighted in green are young zircon ages that correspond to high LREE patterns indicative of possible hydrothermal alteration (see text). Light blue highlighted fields denote spot analyses of older inherited zircon cores visible in cathodoluminescent images. Table A.5. Zircon trace elements (ppm) for samples 5-001b and 5-002a. Spots highlighted in green correspond to the youngest ages and could represent hydrothermally altered zircons from Table A4. Table A.6. Whole rock Sr and Nd isotopic ratios of Chukchi Borderland orthogneiss samples 5-002a and 5-001b. Table A.7. CIPW normative calculations based on major element composition for dredged Chukchi Borderland orthogneiss samples 5-002a and 5-001b. Table A.8. Unnormalized whole rock trace elements (ppm) of Chukchi Borderland orthogneiss samples 5-002a and 5-001b. Table A.9. Whole rock normalized major elements of the Chukchi Borderland orthogneiss samples 5-002a and 5-001b.

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