Explore a comprehensive 56-minute lecture on the evolution of carbonate deposition patterns in the Southeast Atlantic over the past 30 million years. Delve into XRF core scanning techniques used to approximate carbonate content at Wallis Ridge, and uncover insights into climate, cryosphere, and carbon cycle interactions since the early Oligocene. Examine the transition from a unipolar to bipolar world, the importance of carbonate deposition in the carbon cycle, and the previously understudied Atlantic Ocean carbonate deposition. Learn about the XRF core scanning process conducted at Site 1264 between 2011 and 2018, and how this data ensures stratigraphic continuity. Discover the three distinct phases of orbital imprint on CaCO3 deposition, including eccentricity-paced cyclicity during Miocene warmth and precession-driven deposition after the mid-Miocene climate transition. Investigate the onset of the Late Miocene Biogenic Bloom (LMBB), its global recognition, and potential origins. Gain new perspectives on nutrient distribution and its regional differences. Conclude with an overview of the CODD (Code for Ocean Drilling Data) tool and its application in analyzing 30 million years of CaCO3 data to understand climate, cryosphere, and carbon cycle interactions.
Disentangling the Controls and Orbital Pacing of SE Atlantic Carbonate Deposition Since the Oligocene
Seds Online via YouTube
Overview
Syllabus
Intro
The last 34 Myr documents the evolution from a unipolar to bipolar world
Carbonate deposition is an important part of the carbon cycle
Carbonate deposition in the Atlantic Ocean was poorly understood
X-Ray Fluorescence Core Scanning unlocks the sediments chemical composition
We XRF core scanned the entirety of Site 1264 between 2011 and 2018
The XRF data could help ensure stratigraphic continuity
CODD: generate composite core photos...
CODD: ... and composite splice core photos
We used different tuning approaches from 8-0 Ma because eccentricity was weaker
The orbital imprint on Caco, deposition shows three distinct phases
Eccentricity-paced cyclicity (dissolution?) dominates during Miocene warmth
The MCO may have been preconditioned by early Miocene warmth
Precession-driven deposition prevails after the mid Miocene climate transition
High-latitude biomes drove this
The stronger high-latitude processes coincide with the -8 Ma onset of the LMBB
The LMBB is globally recognised, but the origins are not yet understood
The LMBB onset seems synchronous between the Atlantic and the Pacific
Increased nutrients may come from...
The global nutrient distribution may reflect regional differences in...
New insights into the LMBB indicate...
CODD: Code for Ocean Drilling Data
Current version CODD 2.1 for IGOR Pro 7 & 8
A 30 million year CaCO, view of climate, cry and carbon cycle interactions
Taught by
Seds Online
