| 1. Identity statement | |
| Reference Type | Journal Article |
| Site | mtc-m16b.sid.inpe.br |
| Holder Code | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S |
| Identifier | 6qtX3pFwXQZGivnK2Y/Svcba |
| Repository | sid.inpe.br/mtc-m17@80/2007/12.19.12.05 (restricted access) |
| Last Update | 2007:12.19.12.27.12 (UTC) administrator |
| Metadata Repository | sid.inpe.br/mtc-m17@80/2007/12.19.12.05.34 |
| Metadata Last Update | 2018:06.05.03.36.43 (UTC) administrator |
| Secondary Key | INPE--PRE/ |
| ISSN | 0169-1317 |
| Citation Key | SantosJrRossMurr:2007:OrRiCa |
| Title | Origins of the Rio Capim kaolinites (northern Brazil) revealed by delta O-18 and delta D analyses, coexisting minerals; northeastern japan; meteoric waters; climate-change; oxygen  |
| Year | 2007 |
| Month | Sept. |
| Access Date | 2024, Apr. 28 |
| Secondary Type | PRE PI |
| Number of Files | 1 |
| Size | 1350 KiB |
| 2. Context | |
| Author | 1 Santos Jr., Antonio Emidio de Araujo dos 2 Rossetti, Dilce de Fatima 3 Murray, Haydn H. |
| Resume Identifier | 1 2 8JMKD3MGP5W/3C9JGTQ |
| Group | 1 2 DSR-INPE-MCT-BR |
| Affiliation | 1 Universidade Federal do Pará/UFPa, Centro de Geociências, Campus do Guamá S/N Belém-PA 2 Instituto Nacional de Pesquisas Espaciais (INPE) 3 cIndiana University, Bloomington, Indiana |
| Journal | Applied Clay Science |
| Volume | 37 |
| Number | 3-4 |
| Pages | 281-294 |
| History (UTC) | 2008-11-04 16:40:23 :: marciana -> administrator :: 2018-06-05 03:36:43 :: administrator -> marciana :: 2007 |
| 3. Content and structure | |
| Is the master or a copy? | is the master |
| Content Stage | completed |
| Transferable | 1 |
| Content Type | External Contribution |
| Keywords | delta o-18 and delta d kaolinite origin rio capim kaolin stratigraphy northern brazil hydrogen-isotope geochemistry pedogenic clay-minerals surface-temperature exchange deposits |
| Abstract | Deuterium (delta D) and oxygen (delta 18O) isotope data from the Rio Capim kaolin, northem Brazil, were combined with optical studies in order to better understand the genesis and evolution of the kaolinites. The results show that 6180 values from a lower soft kaolin unit range from 6.0%. to 19.2 parts per thousand for Ka (size ranging from I to 3 mu m) and Kb (size ranging from 10 to 30 mu m) kaolinites, and from 15.4 parts per thousand to 24.9 parts per thousand for Kc (size < 200 nm) kaolinites. The delta D values range from -63.1 parts per thousand to 79.5 parts per thousand for the Ka+Kb kaolinites, and from -68.8 parts per thousand to -244.35 parts per thousand. for the Kc kaolinites. An upper semi flint kaolin unit, dominated by Kc kaolinites, displays 6180 and delta D values ranging from 15.1 parts per thousand to 21.8 parts per thousand, and -71.3 parts per thousand to -87.4 parts per thousand, respectively. Based on these data, and on the 6180 and delta D values obtained for the surface meteoric water and groundwater, it can be concluded that the kaolinites are not in equilibrium with the modem weathering environment, but they reflect isotopic cornpositions of the formation time, probably due to the interaction with fossil groundwater. However, mineralogical contaminations derived from replacements of framework grains also had great influence in the isotopic composition of these kaolinites. In addition, the isotope values of the Kc kaolinites from the semi-flint kaolin unit is variable, which is due to the presence of Kc kaolinites of different origins, including kaolinites derived from the underlying soft kaolin unit, kaolinites formed during different phases of pateoweathering, as well as later phases of coarse-grained kaolinites formed along fractures. Due to these complexities, binary diagrams contrasting 6180 and delta D values, worldwide applied for distinguishing supergenic from hypogenic kaolinites, as well as those formed under weathering conditions, can not be applied to interpret the origin of the kaolinites in the Rio Capim Kaolin. |
| Area | SRE |
| Arrangement | urlib.net > Produção anterior à 2021 > DIDSR > Origins of the... |
| doc Directory Content | access |
| source Directory Content | there are no files |
| agreement Directory Content | there are no files |
| 4. Conditions of access and use | |
| Language | en |
| Target File | capimrio.pdf |
| User Group | administrator marciana |
| Visibility | shown |
| Read Permission | deny from all and allow from 150.163 |
| 5. Allied materials | |
| Next Higher Units | 8JMKD3MGPCW/3ER446E |
| Dissemination | WEBSCI; PORTALCAPES. |
| Host Collection | lcp.inpe.br/ignes/2004/02.12.18.39 cptec.inpe.br/walmeida/2003/04.25.17.12 |
| 6. Notes | |
| Empty Fields | alternatejournal archivingpolicy archivist callnumber copyholder copyright creatorhistory descriptionlevel documentstage doi e-mailaddress electronicmailaddress format isbn label lineage mark mirrorrepository nextedition notes orcid parameterlist parentrepositories previousedition previouslowerunit progress project readergroup rightsholder schedulinginformation secondarydate secondarymark session shorttitle sponsor subject tertiarymark tertiarytype typeofwork url versiontype |
| 7. Description control | |
| e-Mail (login) | marciana |
| update | |