USGS
Hawaiian Volcano 
Observatory

East Maui geologic data set

Potassium-argon (K-Ar) and 40Ar/39Ar ages from East Maui volcano (Haleakala), Island of Maui

Age±error
(Ma)
Sample No. Stratigraphic formation TRM Quadrangle Latitude Longitude Reference
0.36±0.07 MaE11 KV N Kilohana 20°45.73' 156°14.03' 6
0.39±0.13 MaE10 KV U Paia 20°51.85' 156°21.25' 6
0.46, 0.44 GA577 KV N Kaupo 20°39.15' 156°05.07' 5
0.49±0.15 MaE8 KV N Kilohana 20°44.56' 156°13.40' 6
0.54±0.13 MaE7 KV U Kaupo 20°40.57' 156°07.49' 6
0.56±0.14 MaE9 KV N Kilohana 20°44.38' 156°14.24' 6
0.70±0.03 MaE5 KV U Nahiku 20°44.06' 156°11.68' 6
0.74±0.04 MaE2 KV R Nahiku 20°42.56' 156°11.76' 6
0.783±0.011 flows 4-6 KV T Kilohana 20°45.33' 156°12.93' 1
0.783±0.013 HO-9 KV N Keanae 20°52.08' 156°10.26' 2
0.78±0.10 MaE6 KV U Kaupo 20°40.48' 156°07.51' 6
0.82, 0.86 GA574 KV R Keanae 20°52.34' 156°10.23' 5
0.83±0.06 MaE4 HB (KF) R Kaupo 20°42.45' 156°12.13' 6
0.83±0.17 MaE1 HB U Keanae 20°51.00' 156°10.75' 6
0.91±0.07 MaE3 HB (KF) R Kaupo 20°42.44' 156°12.27' 6
0.93±0.33 HO-11 HB R Keanae 20°52.08' 156°10.26' 2
0.968±0.044 HO-12 HB R Keanae 20°52.08' 156°10.26' 2
1.104±0.047 HO-21 HB R Keanae 20°52.08' 156°10.26' 2

Ages reported in millions of years (Ma). Analytical error is one-sigma standard deviation.
Samples GA574 and GA577 were reported without analytical error.

All ages are from whole-rock samples. Material sampled is from lava flows except for sample No. MaE8 (0.49±0.15), from a trachyte dike.

KV, Kula Volcanics;
HB, Honomau Basalt;
KF, Rocks once assigned to th Kumuiliahi Formation, now considered part of the Honomanu Basalt.

TRM, Thermal-remanent magnetization: N, normal polarity; R, reversed polarity; T, transitional polarity; U, unknown, not sampled.

Quadrangle names correspond to U.S. Geological Survey 7.5-minute topographic quads.

Latitude and longitude referable to Old Hawaiian datum.

Locations for the HO-series of samples are described only generally in original reference document.

Reference numbers correspond to complete bibliographic listing shown elsewhere.

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Updated: 12 March 1998