SCIENTIFIC OBSERVATION HOLE PROJECT SOH 4 Well VISUAL CORE DESCRIPTIONS Volume 1A September 1990 Compiled by s. Renp Evans, Elizabeth A. Novak and Frank A. Trusdell Puna Research Center P.O. Box 1488 Pahoa, Hawaii 96778 Funded by the State of Hawaii Department of Business, Economic Development and Tourism '. EXPLANATORY NOTES The enclosed visual core descriptions (sheet A) were compiled by the core logging staff at the Puna Research Center, Hawaii. Members of the staff who descibed drillcore from the Scientific Observation Hole #4 are Rene Evans, Elizabeth Novak and Frank Trusdell. Comments and suggestions were provided by John Deymonaz, George Walker and Tonto Drilling Crew. Marth Sykes and Jane Tribble contributed preliminary XRD mineral identifications. Volume lA of the core descriptions contains descriptions for the core obtained in the first 3,499 feet of the Scientific Observation Hole #4. Each page of this volume corresponds to a box of core and a page in volume 1B <below 118 ft). When possible, boxes were filled with ten feet of drillccre, except during PO intervals where each box contained four feet. Each large fragment of core was marked with an up arrow. Woed blocks noted by the drillers mark the footage at the end of each c or" €.~ I'" un • Visual descriptions of the cores are based on observations of handC·' .. ~~pecimE:ms. Ther'efor"e, for Stlme c.lf th€':? mil'lE.~r-<al !Sp€,~c:ie~3 ,and 'th(7? rnClr"E.~ subtle metamorphic textures, field identifications might not be accurate (e.g. phillipsite versus natrolite, laumonite, etc.). We would appreciate being informed of any errors or inconsistencies in these descriptions. Fiene S. Evans ,J ':'lnluar'y 1992 ,.. -'. •r' Brecc i6 ___ CORE LOG JJ BOX't- J HOLE #~ Sheet A Depth-r-a-n-g-e_V to I,B3 Meters Depth range__D__to~feet Logger t s Naf'le ---:____ Page_I of_l_ Type of SaMple: Flow l___ Intrusive_____ Ash ___ NUMber of Units in 80x l___ Fill in blanks below by using the appropriate unit nUMber.