Open-File Report 2009-1254 U.S. Department of the Interior Sheet 2 of 2 U.S. Geological Survey Pamphlet accompanies map '02°761 '01°761 '00°761 LIST OF METAMORPHIC-TECTONIC ELEMENTS HIGH GRADE METAMORPHIC AND ASSOCIATED O

5kb) that are Cape Espenberg settings. The generally brittle shallow and steeply-dipping structures of greenschist facies, but slightly higher grade assemblages occur in Ol the vicinity of Kiwalik Mountain. Lack of high pressure overprinted by relatively lower pressure cordierite plus staurolite or Ol Ol Oal in the area may have formed in shallow contractional settings, Ol metamorphic minerals may be significant or a product of poor garnet assemblages (<5kb). Timing of peak metamorphism and 65°30' Ol extensional settings, or both Ols exhumation may not be the same in Kigluaik, Bendeleben, and Ol NOME COMPLEX – Late Proterozoic and Paleozoic exposure and limited sampling. Metamorphic history of this block Darby mountain ranges. Kigluaik and Bendeleben ranges formed in Ols metasedimentary and metaigneous rocks, metamorphosed during the may not be consistent throughout and the block may be cut by SOul the Tertiary and are bounded by active faults Jurassic unrecognized faults GRANTLEY HARBOR FAULT ZONE – Weakly metamorphosed Nome Complex, central – Penetratively deformed and Nome Complex, northern – Weakly foliated metasedimentary and SOdl metasedimentary rocks with stronger deformational fabrics than recrystallized schists with ductile fabrics; mineral assemblages unfoliated metaigneous rocks; mineral assemblages in small 14 O

Ocs i Ocs Dg R

Ols Ktg O

12 x Df |m

o Kbk Approximate position of second sillimanite isograd; teeth towards n d 58,59,60,61,62,63,64 i a N r o t Kbk i higher-grade rocks R z

O

e K 57

DOx r 9 v Ksy o QTv

l i |

QTv e y CONODONT COLOR ALTERATION INDEX (CAI) VALUES QTv R Kbk a

n T o - k e Z |p DOx o DOx |m m r [See appendix, including tables A-1 and A-2 in pamphlet, for more t o a DOx N l g Ddm QTv u DOx |

Ds NATIONAL GEODETIC VERTICAL DATUM OF 1929 Kkms cil un Contact – Metamorphic-tectonic elements Co Ds e- Kgu m |m No

Sledge Island Nome Major fault or tectonic subdivision boundary – Dashed where 159°

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