کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8914891 | 1640749 | 2018 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Is the core top modern? Observations from the eastern equatorial Pacific
ترجمه فارسی عنوان
آیا هسته بالا مدرن است؟ مشاهدات از شرق اقیانوس آرام شرقی
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کلمات کلیدی
MAREEPOntong Java PlateauMFISECCEP - MOBILEequatorial Pacific - اقیانوس آرام استوارEastern Equatorial Pacific - اقیانوس آرام اکواتوری شرقیCentral Equatorial Pacific - اقیانوس آرام اکواتوری مرکزیCalcite dissolution - انحلال کلسیتRadiogenic isotopes - ایزوتوپهای رادیوژنSouth equatorial current - جریان جنوبی استواوریPaleoceanography - دیرینه اقیانوس شناسیBioturbation - زیست آشفتگیMass accumulation rate - میزان انباشت تودهmass accumulation rates - میزان انباشت تودهHolocene - هولوسن
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
چکیده انگلیسی
A compilation of ages from 67 core tops in the eastern equatorial Pacific (EEP) does not display an easily discernible regional pattern. The ages range from 790 to over 15,000 years. The youngest core tops with the highest sediment focusing factors are located in the Panama Basin. There are weak but statistically significant inverse relationships between core top age and age-model based mass accumulation rates, bioturbation depth, linear sedimentation rate and sediment focusing factors. However, we found no statistically significant relationship between core top age and calcite dissolution in sediments or 230Th-normalized mass accumulation rates. We found evidence suggesting that greater amount of sediment focusing helps to preserve the carbonate fraction of the sediment where focusing is taking place. When focusing factors are plotted against percent calcite dissolved, we observe a strong inverse relationship, and core tops younger than 4500 years tend to occur where focusing factors are high and percent calcite dissolved values are low. Using labile organic carbon fluxes to estimate bioturbation depth in the sediments results in the observation that where bioturbation depth is shallow (<4â¯cm), the core top age has a strong, inverse relationship with sediment accumulation rate. We used the Globorotalia menardii Fragmentation Index (MFI) as an indicator of percent calcite dissolved in deep sea sediments. There is a distinct pattern to core top calcite dissolution in the EEP which delineates bands of high surface ocean productivity as well as the clear increase in dissolution downward on the flanks of the East Pacific Rise.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary Science Reviews - Volume 186, 15 April 2018, Pages 156-168
Journal: Quaternary Science Reviews - Volume 186, 15 April 2018, Pages 156-168
نویسندگان
Figen Mekik, Robert Anderson,