| Abstract: | A pilot study was carried out on two relatively deep drill-cores (??? 600 m) from the Go??temar Granite massif in S.E. Sweden. This granite is typical of the 1400-Ma anorogenic granites of the northern hemisphere. Samples from representative, unfractured parts of the cores, together with four samples taken along a profile tangential to a fracture plane at ??? 280-m depth, were investigated chemically, mineralogically and isotopically. The results show that after crystallisation, subtle and pervasive open-system modifications of the trace-element chemistry of the granite took place. Whereas the major-element chemistry and minera-logical data emphasised the relative homogeneity of the Go??temar Granite samples investigated, trace elements such as U, Rb, and Pb revealed irregular distributions which are probably the result of large-scale hydrothermal alteration processes. This conclusion is supported by isotopic studies which indicate that whole-rock samples were open to a gain or loss of Pb and possibly U at ??? 420 ?? 171 Ma ago. In addition, isotopic data for U-Pb and U-Ra are consistent with a recent minor loss of U. The pervasive alteration and the more recent mobilisation of U are evident to a depth of at least 600 m. The effects are most prevalent along major fracture zones and within the upper 250-300 m of one drill-hole where a high frequency of crush zones has been noted. Higher Fe oxidation ratios, higher Rb contents, lower U contents and correspondingly higher Th/U ratios, all characterise this zone. ?? 1985. |
| Genre: | Article |
| ProdID: | 70013111 |
| Citation Author: | Smellie, J. A. T.; Stuckless, J. S. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 78 |
| Citation Issue: | 1-2 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Chemical Geology |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 24 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | Elsevier |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Element mobility studies of two drill-cores from the Go??temar Granite (Kra??kema??la test site), southeast Sweden; 1985; Article; Journal; Chemical Geology; Smellie, J. A. T.; Stuckless, J. S. |
| Citation Start Page: | 55 |
| Citation Volume: | 51 |
| Citation Year: | 1985 |
| Type: | citation/reference |
| Text: | Element mobility studies of two drill-cores from the Go??temar Granite (Kra??kema??la test site), southeast Sweden; 1985; Article; Journal; Chemical Geology; Smellie, J. A. T.; Stuckless, J. S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/0009-2541(85)90087-7 |
| Date Other: | Tue, 1 Jan 1985 00:00 -0600 |
| Publisher: | Elsevier |
