By Bernhard J. Knipping, Ralph B. Phillips
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Additional resources for Basalt intrusions in evaporites
L"/" , fephnte •. ~lt ,~ • ~ phonolite n . s •" "'-. o # phonolite , / s" ..... / trachyte t / I 7' / ......... -1000 t ' ~ trachy- • ,s s J ........... " basalt. ¢ . ~ • ; Lati- I ; f - " ~s~ hawaiite# , andesi-basalt v ~ i basalt mugearite "" - ~-r'" / tholeiite t Il # I .... -"" _ . :'~"" dacite • .... ,,""" rhyodacite quartz* trachyte 10'00 t . - , ~des,e', ~ '#-. . . . ~ s / # • "~-. "- - "" rhyolite ...... ~------. alkali - rhyolite t. . . . . . . . . 20'00 4Si-2(Ti*Fe)-I 1(Na*K) R 30'00 1 Fig.
K) = 3000 R Fig. 5 The most extreme points of those shown in fig. 3 for one rock type were connected in order to clarify the range of variation in the chemical composition of the different basalts from the Werra mining district (further explanation in text). 59 The resets of the microscopy are largely confirmed when the results of the chemical analyses are depicted in this way. The following statements can be made based on this evaluation: 1. , titanaugite, plagioclase). 2. Similarities in the conditions of formation are underscored by the overlapping areas in the R1-R2 diagram covered by the studied olivine nephefinites, limburgites, and basanites (fig.
They consequently confirm the observations made with the microscope. Calculating the composition In contrast to fresh basalts and surface samples, many subsurface samples have a Na/ K ratio of < 1. Hence, the (Na+K)/Si ratio (RINoWOOD1975) was not able to be used for supplementing the petrographic classification of the subsurface basalts based on microscopy. The calculation of the CIPW norm is unsuitable as well because slight deviations in the amounts of alkali elements give rise to great differences in the amounts of CIPW-normative minerals.
Basalt intrusions in evaporites by Bernhard J. Knipping, Ralph B. Phillips