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Map and tables shoving preliainary rock geochemical

data, Port Xoller, Stepovak Bay, and Simeomf Island

quadrangles, Alaska

Linda 1. Angeloni1

Frsderic B. wilsonl

and

Stephen Sucley 2

Open-File Report 85-470

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature.

1. Anchorage, Alaska 2. Denver, Colorado

CONTENTS Page

......................................................... Introduction 1

..................................... Analytical methodology ;. . . 1 .................................................. Statistical analysis 170

............................................... Explanation of results. 179 ...................................................... References cited 179

ILLUSTRATIONS

Plate 1 . Rock geochemistry sample location map. Port Moller. ...... Stepovak Bay. and Simeonof Island quadrangles. Alaska at back

Figure 1 . Index map showing location o f Port Moller. Stepovak Bay. .......... and Simeonof Island quadrangles. A1 aska Peninsula 2

TABLES

....... Table 1 . Lower 1 imit of determination for respective elements

. 2 Analytical results. rock geochemistry ...................... .... . 3 Summary of statistical data for nine elements following

........................... 3a . Statistical data for Ag ........................ . 3b Statistical data for As-AA

........................... . 3c Statistical data for Ba

........................ . 3d Statistical data for B i - A A

3e . Statistical data f o r Cu ........................... ........................... . 3 f Statistical data for Mo

39 . Statistical data for Pb ........................... . ........................ 3h Statistical data f o r Sb-AA

........................ 3i . Statistical data for Zn-AA

Map and tables showing preliminary rock geochemical data, Port Moller, Stepovak Bay, and Sirneonof Island

quadrangles, Alaska

Linda M. Angeloni, Frederic H. Wilson and Stephen Sutley

Introduction

The accompanying map and tables show sample locations and list chemical analyses of 1,841 rock samples that were collected in conjunction with geologic mapping in the Port Moller, Stepovak Bay and Sirneonof Island quadrangles from 1982-1984. This work has been conducted under the auspices of the Alaska Mineral Resource Assessment Program (AMRAP). This report is preliminary and is intended to make this data available in a timely and expeditious manner. Rock samples collected during the 1985 field season will be included in a subsequent, more detailed report. Several areas considered to have potential for economic mineral occurrences, as indicated by geochemical sampling, are briefly discussed k x p l a n a t i o n of results, p . 179) .

An attempt was made to obtain a detailed sampling of all rock types, however more samples were collected from areas of surface alteration. Samples are primarily a single grab, although a fev are composite. No attempt is made in this report to group samples according to rock type; however, future studies will endeavor to characterize rock units based on rock geochemistry. Sample locations are shown on Plate 1; few samples were collected from the northwest part of the Port Moller quadrangle along the Bering Sea because t h i s lowland area is mantled by unconsolidated Quaternary deposits, and few samples were collected from the Pavlof volcanoes due to difficult access and low snow lines persisting throughout the summer.

Samples were collected by the following investigators, with their respective two letter identifying code shoun in parentheses: L. M. Angeloni (Ai), J. E. Case (Ce), C. L. Connor (Cc), R. L. Detterman (Dt), B. M. Gamble (Ge), J. W. Miller (Jm), M. L. Pernokas (Pk), N. B. Shew (Sh), F. R. Weber (Wr), F. H. Wilson (Ws), and M. E. Yount (Yb). These identifying codes are used in Plate 1 and in Table 2.

Analytical methodology

Analyses were made for 31 elements with a DC-arc emission spectrograph ( S ) using a six-step, semiquantitative method described by Grimes and Maranziuo (1968). In addition, atomic absorption apectrophotometry (AA) was used to determine antimony, arsenic, bismuth, cadmium, and zinc. Analyses for both emission spectrograph and atomic absorption specrrophotometry are reported in parts per million, except for Fe, Mg, Ca and Ti which are reported in percent. Analysts were: Stephen Sutley, J. D. Hoffman, D. L. Kelley, R. M. OILeary, B. Asbogast, M. S. Erickson, W. C . Martin, and Betty Bailey.

Figure 1. Index map showing l o c a t i o n o f P o r t Moller, Stepovak Bay,

and Sirneonof quadrangles, Alaska Peninsula,

The semiquantitative spectrographic analyses are reported in values of s i x Bteps per order of magnitude. These s t e p s are the approximate geometric midpoints of the class intervals shown below:

Reported value 1 .o 1.5 2.0 3.0 5.0 7.0

Class interval 0.83 --- 1.2 1.2 -- 1.8 1.8 -- 2 . 6 2.6 --- 3 .8 3.8 -- 5.6 5 .6 -- 8.3

Matooka and Grimes (1976) evaluated the precision of the semiquantitative method; repeatability of a determination within plus or minus one and two reported values is approximately 83 and 96 percent respectively. Analyses done by AA are not reported on the six-step scale; these quantitative values reflect both the higher precision and the lower determination limits of the met hod.

Table 1. Lover limit of determination for respective elements [All analyses are emission spectrography unless otherwise noted: AA, atomic absorbtioa spectrophotometry.]

ElementL L i m i t Element ' Limit ~lement ' L i m i t

Th v W Y Zn AA-As AA-B i AA-Cd AA-S b AA-Zn

'~e, Hg, Ca, and Ti in percent, all other analyses in parts per million.

Sample type 11 Single (grab)

I 12 Composite 13 Channel 14 Pan concentrate 15 Other

11 7 Outcrop rubble I 12 Mine

13 Dump/prospect 14 Float 15 Other

Rock type L2 Sedimentary

I 13 Metamorphic 14 Igneous 15 Unconsolidated 16 Other

Table 2. Analytical results, rock geochemistry, Port Moller, Stepovak Bay, and Sirneonof Island quadrangles, Alaska. (Analyses are emission spectrography ( 8 ) except where noted: atomic absorbtion spectrophotometry (aa). Fe, Mg, Ca, and Ti are in percent, all other analyses in parts per m i l l i o n . N = not detected. ]

Explanation of geochemical rock sample codes

(pages 9 , 13, e t c . )

FCl-1~63,360 scale quadrangle, letter designation

11 A 12 B 13 C 1 4 D

FC2-1 : 63,360 scale quadrangle, number designation

FC3-Type of collection 11 Primary 12 Resample . 13 Replicate : 14 Reanalysis 15 Other

FC4-~ock' representat r on 11 Background - major 12 Background - lesser 13 Atypical - very minor 14 Atypical - mineralized

FC5-Form 11 Bed 12 Massive 13 Foliated 14 Pluton 15 Dike or Sill 16 Extrusive 17 Vein 18 Fault 19 Not coded

FC6-Rock name 11 F e l d s p a t h i c sandstone 12 L i t h i c sandstone 13 Sandstone 14 Shale 1 5 Siltstone 16 Conglomerate 18 Argillite 19 Limestone 20 Basalt 21 Volcanic breccia 22 Andesi te 23 Tuff 24 Quartz diorite 25 Granodiorf te 26 Quartz monzonite 27 Diorite 36 Other 3 7 Not coded

4

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Latitude

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Statistical analysis

S~atiatical data is summarized in table 3 for nine elements: Ag, As, Ba, Bi, Cu, Mo, Pb, Sb, and Zn. These elements were selected because they are considered to be indicative of potential e&onomic mineralization. Data was processed by a computer for each of these elements, using all 1,841 samples, to produce frequency distribution tables (table 3). The minimum, maximum, arithmetic mean, standard deviation, geometric mean, and geometric deviation were also calculated, and recomputed for qualified data. If any data values are qualified with codes, N (not detected), L (detected in amount less than lower limit of determination), T (detected in trace amount), or G (detected in amount greater than upper limit of determination), the MIN, MAX, AMEAN, SD, WEAN, and GD are recomputed after setting all values with code N equal to 1/4 the lower determination limit, setting all values with L or T codes equal to 1/2 the lower determination limit, and setting values with the code G to twice the upper determination limit. These estimates are usually good when the percent of qualified values is small; becoming increasingly poor as that percentage increases.

The number of samples at any specified value and the corresponding percentage of samples at, below, or above, this specified value are shown in the columns labelled "FREQ." (frequency) and "TOT CUM X" (total cummulative percent) respectively. The "TOT CUM X" is useful for determining anomaly levels for each element beacuse it indicates what percentage of the data is greater than (or less than) any partlcular value. For the purposes of this report we have arbitrarily chosen the 98th percentile to define anomaly levels; the anomalous value for each element can be determined directly from table 3.

Table 3 contains both qualified and unqualified data. Unqualified data are labeled "UNQUAL" and represent samples analyzed that contain detectable amounts of an element. Qualified data, those columns labeled "B", "T", "H", "N", "L", and "G", are samples that did not contain detectable amounts of an element. The letters B, T, H, N, L, and G are used t o designate the different reasons that an element was not detected in a sample. For example, L means that an element was present in the sample at an amount "less than" the lower limit of determination. Columns labelled "B", "T", "H", "N", "Lo, "G" , "OTHER", and "UNEQUAL" show both the number of values, "VALUE", and the percentage of values, "PERCENT", ( a s the percent of the total number of valid data values) for each column. The following is an explanation of headings and abbreviations used in table 3.

~ a - b l e 3 . Summary of s t a t i s t i c a l data for nine elements, rock geochemistry.

VALUE the data value range boundary FREQ. number of occurances of this value X = frequency as percent of total number of valid data

values (ANAL) CUM = number unqualified records at & below th i s value CUM X

(cal 1)s unqualified values a t or below this value, as I of ANAL (col 2)- unqualified values above this value, as X of total no.

valid data values (ANAL) TOT CUM * number of values (N,L,T + unqualified) at or below this value TOT CUM % (eol 1)s values not B,H,OTHER at or below thAs value, as X of

total no. val id data values (ANAL) (col 2)s values not B,B,OTHER above this value, as % of (ANAL)

--11--1--1----------

B - value - no. values qualified wirh 'B' (* no data) - percent = X of a l l records read (BEAD)

T - value = no. values qualified wffh 'T' (= trace) - percent = Z of all values not B,B, or OTHER (ANAL) N - value = no. values qualified with 'H' (I interference) - percent a X of all values not B,H, or OTHER (ANAL) N - value * no. values qualified with 'N' (= not detected)

- percent = Z of all values nat B,E, or OTHER (GNAL) L - value = no- values qualified with 'L' (= less than) - percent = X of all values not B,H, or OTHER (ANAL) G - value = no. values qualified wirh 'G' (9 greater than) - percent a X of all values not B,H, or OTHER (ANAL)

OTHER - value no. qualified values not equal B,T,H,N,L,G - percent - % of all records read (READ)

UNQUAL - value = no. unqualified data values - percent = X of all. values nor B,H, .or OTElER (ANAL)

ANAL - total no. val id data values ( 9 unqualified + N,L,T,G) READ = no. input records read

-----1-1----------1------

MIN = minimum unqualified value MAX * maximum unqualified value . AMEAN = arithmetic mean of unqualified values SD = standard deviation of unqualified values GMEAN geometric mean af unqualified values GD = geometric deviation of unqualified values VALUES = no. of data values used to compute the above s t a t i s t i c s .

Note: values of zero are excluded from the calculation of geometric mean and deviation because they are undefined.

Table 3a. Statistical data for Ag, rock geochemistry, Port Moller, Stepovak Bay, and Sirneonof Island quadrangles, Alaska.

VALUE ( D D ~ ) FREO. % CUM. CUM. X TOT CUM TOT CUM %

B T H N L G OTHER UNQUAL ANAL READ 1 0 0 1704 83 0 0 53 1840 1841 VALUES

0.1 0.0 0.0 92.6 4.5 0.0 0.0 2.9 PERCENT

MIN MAX AMEAN SD GMEAN GD VALUES . 0.500 150.00. 7 362 22.54 1.647 4.02 53 0.125 150.00 0.339 3.98 0.139 1 66 1840

Table 3b. Statistical data for As-AA, rock geochemistry, Port Moller, Stepovak Bay, and Sirneonof Island quadrangles, Alaska.

VALUE (ppm) FREQ. % CUM. CUM. X TOT CUM TOT CUM X


0.1 0.0 0.0 64.0 10.2 0.0 0.0 25.8 PERCENT

MIN MAX AMEAN SD GMEA.N Q) VALUES 10.000 26000.00 130.800 1292.25 19.454 2.86 475

Table 3c. Statistical data for Ba, rock geochemistry, Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska.

VALUE (ppm) FREQ. % CUM. CUM. X TOT CUM TOT CUM I

B T H N L G OTWK UNQUAL ANAL REkD 1 0 0 5 32 1 0 1802 1840 1841 VALUES

0.1 0.0 0.0 0.3 1-7 0-1 0.0 97.9 PERCENT

MIN MAX AMEAN SD GMEAN GD VALUES 20.000 5000.00 571.160 520.00 395.963 2.50 1802 5.000 10000.00 564.986 565.22 367.681 2.87 1840

Table 3d. Statistical data for BI-AA, rock geochemistry, Port ~oller, Srepovak Bay, and Simeonof Island quadrangles, Alaska.

VALUE (ppm) FREQ. % CUM. CUM. % TOT CUM TOT CUM Z

B T H N L G OTHER UNQUAL ANAL READ 124 0 0 1706 0 0 0 11 1717 1811 VALUES 6.7 0.0 0.0 99.4 0.0 0.0 0.0 0.6 PERCENT

M I N MAX AMEAN SD GMEAN CD VALUES 2.000 190.00 48.727 74.16 14.074 5.29 11

. . . . . . Table 3e. Statistical data for Cu, rock geochemistry, Port Moller ,

Stepovak Bay, and Simeonof I s land quadrangles, Alaska.

VALUE (ppm) FREQ* % , CUM. CUM. % TOT CUM TOT CUM %

B T H N L G OTHER UNQUAL ANAL WAD 1 0 0 20 86 0 0 1734 1840 1841 VALUES

0.1 0.0 0-0 1.1 4.7 0.0 0.0 94-2 PERCENT

MIN MAX AMEAN SD GMEAN QY VALUES 5.000 5000.00 51.975 154.12 29.679 2.57 1734

Table 3 f . S t a t i s t i c a l data for Mo, rock geochemistry, Port Mol ler , Stepovak Bay, and Simeonof Island quadrangles, Alaska.

VALUE (ppm) FREQ. X CUM. CUM. X TOT CUM TOT CUM X

B T H N L G OTHER WQUAL ANAL READ 1 0 0 1694 34 0 0 112 1840 1841 VALUES

0.1 0.0 0.0 92.1 1.8 0.0 0.0 6.1 PERCENT

MZN MAX AMEAN SD GMEAN GD VALUES 5.000 200.00 22.125 34.09 11.563 2.71 112 1.250 200.00 2.544 9.75 1.450 1.80 1840

Table 3g. S t a t i s t i c a l data for ~ b , rock geochemistry, Port ~oller, Stepovak Bay, and Simeonof Island quadrangles, Alaska.

VALUE (ppm) FREQ. X CUM. CUM. % TOT CUM TOT CUM %


0.1 0.0 0.0 14.1 26.4 0.0 0.0 59.6 PERCENT

M I N MAX AMEAN SD CMEAN GD VALUES 10.0 0 10000.0 0 1.73 1096

2 500 10000.00 19.270 236.03 9.097 2.31 1840

Table 3h. Statistical data for Sb-AA, rock geochemistry, Port Moller, S tepovak Bay, and Simeonof Island quadrangles, Alaska.

VALUE (ppm) FREQ* % CUM. CUM. % TOT CUM TOT CUM %


0.1 0-0 0.0 86.1 4.7 0.0 0.0 9.2 PERCENT

MIN NAX AI4EA.N SD GMEAN GD VALZTES 2.000 300.00 7.147 25.18 3.275 2.34 170 0.500 300.00 1.138 7.87 0.614 1.84 1840

. . . Table 31. Statistical data for ZU-AA, rock geochemistry, Port Moller ,

Stepovak Bay, and Simeonof Island quadrangles, Alaska.

VALuE (pprn) FREQ. % CUM. CUM. X TOT CUM TOT CUM X

5.000 28 1.52 28 1.5 97.2 51 2.8 97.2 10.000 35 1.90 63 3.4 95.3 86 4.7 95.3 15.000 28 1.52 91 4.9 93.8 114 6.2 93.8 20.000 63 3.42 154 8.4 90.4 177 9.6 90.4 25.000 71 3,86 225 12.2 86.5 248 13.5 86.5 30.000 105 5.71 330 17,9 80.8 353 19.2 80.8 35.000 103 5.60 433 23.5 75.2 456 24.8 75.2 40-OQO 103 5.60 536 29.1 69.6 559 30.4 69.6 45.000 96 5.22 632 34.3 64.4 655 35.6 6 4 * 4 50.000 131 7.12 763 41.5 57.3 786 42*7 57.3 55.000 111 6.03 874 4705 51.3 897 48.7 51.3 60oOOO 113 6.14 987 53.6 45.1 1010 54.9 45.1 65.000 108 5.87 1095 59.5 39.2 1118 60.8 39.2 70.000 111 6.03 1206 65.5 33.2 1229 66.8 33.2 7SoOOO 91 4.95 1297 70.5 28.3 1320 71.7 28.3 80.000 90 4.89 1387 75.4 23.4 1410 76.6 23.4 85.000 74 4.02 1461 79.4 19.3 1484 80.7 19.3 90.000 59 3.21 1520 82.6 16.1 1543 83.9 16.1 95.000 55 2.99 1575 85.6 13.2 1598 86.8 13.2 100.000 76 4.13 1651 89.7 9.0 1674 91.0 9.0 110.000 64 3-48 1715 93.2 5.5 1738 94.5 5.5 120.000 35' 1.90 1750 95,l 3.6 1773 96.4 3.6 130.000 20 1.09 1770 96.2 2.6 1793 97.4 2.6 140.000 10 0.54 1780 96.7 2.0 1803 98.0 2,O 150 .OOO 7 0.38 1787 97.1 1.6 1810 98.4 1.6 160.000 3 0.16 1790 97.3 1.5 1813 98.5 1,5 170.000 1 0.05 1791 97.3 1,4 1814 98.6 1.4 180 .OOO 2 0.11 1793 97.4 1.3 1816 98.7 1.3 190 000 1 0.05 1794 97.5 1.3 1817 98.8 1.3 200 • 000 2 0.11 1796 97.6 1.1 1819 98-9 1.1 230.000 1 0.05 1797 97.7 1.1 1820 98.9 1*1 250.000 2 0.11 1799 97.8 1.0 1822 99.0 1.0 260 .OOO 1 0.05 1800 97.8 0.9 1823 99.1 0.9 400.000 1 0.05 1801 97.9 0.9 1824 99.1 0.9 490.000 1 0,05 1802 97.9 0.8 1825 99.2 0.8 530.000 1 0.05 1803 98.0 0.8 1826 99.2 0.8 550.000 1 0.05 1804 98,O 0.7 1827 99.3 0.7 580.000 2 0.11 1806 98.2 0.6 1829 99.4 0.6

Table 31. Statistical data f o r ~n-AA, continued.

VALUE (ppm) FREQ* % CUM. CUM. % TOT CUM TOT CUM 2

B T H N L G OTJIER UNQUAL ANAL READ 1 0 0 8 15 0 0 1817 1840 1841 VALUES

0.1 0.0 0.0 0.4 0.8 0.0 0.0 98.8 PERCENT

MIN MAX AMEAN SD GMEAN GD VALUES 5.000 10000*00 81.120 336.75 54.102 2.01 1817 1.250 10000.00 80.132 334.75 51 905 2.19 1840

Explanation of results

The prcliminaxy nature of this report precludes a discussion of each anomalous sample, however several areas of interest are herein described. Using the information in table 3, three locations are indicated that contain samples that are anomalous in six or more elements. These locations were chosen because the combination of elements is considered to indicate the potential occurrence of precious and/or baae metal veins, and/or Cu and/or Mo porphyry deposits. The first area, on Mitrofania Island in the Stepovak Bay quadrangle, is an intensely fractured zone of limonite stained, serlcitized and argillized volcanic rocks. Along the west coast of the west arm of the island numerous quartz and calcite veins, 2 to 15 cm wide, contain visible pyrite, pyrtohtite, arsenopyrite, chalcopyrlte, and sphalerite (person comm. B. M, Gamble, 1985). Samples collected contain anomalous amounts of Ag, A8, Cu, Pb, Sb, and Zn.

The second area is along the southern coast of Unga Island on the east side of Acheredin Bay where samples were collected f r m a hydrothemally altered zone of primarily volcanic rock with minor sedimentary rock. Argillic and sexicitic alteration is pervasive; pyrite occurs as very thin, 2-3 mm, stratiform layers, and is replacing the original rock in a manner that preserves original structure and texture. No other sulfides are visible. Samples collectad from this area are anomalous in Ag, As, Bi, Cu, Mo, Pb, Sb, and Zn.

The third area is at the very northern edge of the Stepovak Bay quadrangle along Kuiukta Bay. At station 83AWs 57 a 3-5 cm wide vein contains visible pyrite and chalcopyrite. The vein cross-cuts bedding and is parallel to jointing in hornfelsed slltstone of the Hoodoo Formation. Sample collected at this station contains anomalous amounts of Ag, As, Bi, Cu, Pb, Sb, and Zn.

Emphasis given here to these three locations is not meant to imply that anomalous geochemical values are restricted to these areas. They are noted to guide the reader to locations where rocks containing anomalous concentrations of elements are abundant. More detailed work is required to evaluate the significance of the mineralization at these locations.

References cited

Grimes, D. J., and Maranzino, A. P., 1968, Direct-current arc and alternating- current spark emission spectrographic field methods f o r the semiquantitative analysis of geologic materials: U.S. Geological Survey Circular 591, 6 p.

Matooka, 3. M., and Grimes, D. J., 1976, Analytical preclsion of one-sixth order semiquantitarive spectrographic analysis: U.S. Geological Survey Circular 738, 25 p.

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