The goal of this series of posts is to share my own journey of fascinating discoveries that have helped me gain a realistic appreciation for this Earth I inhabit and the climate system that governs the biosphere all of us depend on. I do this because too many faith-based people have totally disconnected from physical reality, they believe that the constructions of their imaginations have more power that the geophysical reality outside our abodes. This has led to disastrous choices on many different levels.
If there's any hope to be found in the future it will come from individuals rediscovering the real physical planet we inhabit and honestly assessing how our society and it's runaway population have impacted our planet's biosphere and our future prospects.
In the first post I shared the NOVA/PBS/NASA video "Earth From Space" which gave a nice overview of our dynamic planet and the incredibly complex web of connections that go into creating our biosphere. Since I'm convinced an understanding of evolution is key to appreciating the world we inhabit, I'm beginning with some fundamental evolution stories.
I intended to start my review with our atmosphere's evolution, but in working on that post I realized there's an even more fundamental evolution to consider. In this post will take it down to basic building blocks, namely a lecture given by Dr. Robert Hazen: "The Story of Earth: How Life and Rocks Co-Evolved".
I intended to start my review with our atmosphere's evolution, but in working on that post I realized there's an even more fundamental evolution to consider. In this post will take it down to basic building blocks, namely a lecture given by Dr. Robert Hazen: "The Story of Earth: How Life and Rocks Co-Evolved".
Incidentally many of the posts in this series will simply be an embedded excellent lecture by a leading authority followed by my time-signature notes on the lecture and further information for the curious and I will keep my opining to a minimum.
You can find the lecture notes and information regarding Dr. Robert M. Hazen and his work below this video.
You can find the lecture notes and information regarding Dr. Robert M. Hazen and his work below this video.
CarnegieInstitution | 57:29 minutes | given February 20, 2014
Published on Jul 29, 2014 - CarnegieInstitution - 57:29 minutes
Dr. Robert Hazen, Carnegie Institution for Science, Geophysical Laboratory
The story of Earth is a 4.5-billion-year saga of dramatic transformations, driven by physical, chemical, and—based on a fascinating growing body of evidence—biological processes. The co-evolution of life and rocks, the new paradigm that frames this lecture, unfolds in an irreversible sequence of evolutionary stages. Each stage re-sculpted our planet's surface, each introduced new planetary processes and phenomena, and each inexorably paved the way for the next. This grand and intertwined tale of Earth's living and non-living spheres is only now coming into focus.
Sequential changes of terrestrial planets and moons are best preserved in their rich mineralogical record. "Mineral evolution," the study of our planet's diversifying near-surface environment, began with a dozen different mineral species that formed in the cooling envelopes of exploding stars. Dust and gas from those stars clumped together to form our stellar nebula, the nebula formed the Sun and countless planetesimals, and alteration of planetesimals by water and heat resulted in the approximately 250 minerals found today in meteorites that fall to Earth.
Following Earth's growth and separation into the core, mantle, and crust, mineral evolution progressed by a sequence of chemical and physical processes, which led to perhaps 1500 mineral species. According to some origin-of-life scenarios, a planet must evolve through at least some of these stages of chemical processing as a prerequisite for life. Once life emerged, mineralogy and biology co-evolved, as changes in the chemistry of oceans and atmosphere dramatically increased Earth's mineral diversity to the almost 5000 species known today.
==========================================================
Introduction
{The one that rocked the world's population - I remember, I was there.}
{Only to have it's profundity fade away and forgotten as our primal greed and selfishness quickly regained it's hold on our collective imagination.}
The story of Earth and four intertwined themes:
The evolution of minerals
The origins and evolution of life
The rise of oxygen
The do-evolution of life and rocks
08:00 - Dr. Hazen giving credit to his collaborators - 20 institutions and over 40 collaborators listed
8:45 - Mineral Evolution is change over time in:
The diversity of mineral species
The relative abundance of minerals
The compositional ranges of minerals
The grain sizes and shapes of minerals
10:00 - How do minerals form? New minerals form through a combination of chemical, physical, and biological processes.
10:15 - Dr. Hazen takes a moment to comment on his use of the term "evolution" in the context of minerals.
The word evolution has several meanings
Change over time such as Norman Bowen's (1929) "Evolution of the Igneous Rocks"
Implications of complexification
Congruency
BUT, it is not Darwinian evolution!
14:15 - What was the first two minerals formed from cooling of carbon rich regions in nebula.
First Diamonds at 4,400° above absolute zero
Then Graphite at 4,000° above absolute zero.
Then Graphite at 4,000° above absolute zero.
Ur-Mineralogy
16:45 - Star's Life Cycles, subsequent generations of stars and planets - mineral diversification
17:00 - Stage 1: Primary Chondrite Minerals - ~4.56 billion years ago
electrostatic forces forming cosmic dust bunnies - from 12 to 61 minerals
17:50 - Stage 2: Alternation of planetesimals by heat, water, and impacts
4.56-4.55 billion years ago - up to 250 minerals
Feldspars
Quartz
Micas
Clays
Zircon
Calcite
18:50 - Stage 3: Planet Formation - 4.5 to 4.0 billion years ago
Formation "Dry" Planet - ~300 mineral species
Formation "Wet" Planet - ~420 mineral species (hydroxides, clays)
Earth took it a few steps further.
20:00 - Stage 4: Granite Formation - 3.5 billion years ago
Earth and tectonic activity - partial melting of basalts / sediments
>1,000 mineral species (pegmatites) -
Requiring many cycles of remelting, select and concentrate - billion+ years
21:20 - Stage 5: Plate tectonics - 3 billion+ years ago
reprocessing mantle rock - high-pressure metamorphic suites
blueschists, granulites, UHP phases - 1,500 minerals species
(Stage 3-5 - Fluid-rock interactions associated with igneous activity and plate tectonics, led to a greater diversity of geochemical environments and thus mineral species.)
22:45 - Earth's chemical and physical processes resulted in up to 1,500 different mineral species. How did we get to almost 5,000 mineral species on Earth today?
The answer is life.
22:55 - Origin of life ~4 billion years ago required some minimal degree of mineral evolution.
23:20 - Stage 6: Anoxic Archean biosphere - 4.0-2.5 billion years ago
~1,500 mineral species - BIFs (banded iron formations), carbonates, reefs
23:50 - Archaea bacteria - oxidation reduction reactions - ferredoxin
25:30 - Stage 7: Paleoproterozoic Oxidation - 2.5-1.85 billion years ago
>4,500 mineral species, including perhaps >3,000 new oxides/hydroxides/carbonates
Rise of oxygenic photosynthesis -
26:00 - Hypothesis: Approximately 2/3rds of all known mineral species cannot form in an anoxic environment. Most known minerals are thus a consequence of biological activity.
27:15 - What was the oxygen level in the Archean Eon?
Hematite, Magnetite - buffered system -
27:45 - With no oxygen during Archean Eon, what minerals could form?
Iron, carbonate - FeCO3 - Siderite
What minerals couldn't form?
All 369 copper oxide minerals
~220 of 233 U minerals
~400 of 499 Mn minerals
>100 of 142 Ni minerals
>700 of 1,025 Fe minerals
Since most minerals we find today are oxidized byproducts of minerals that already occurred on Earth.
29:40 - Evolution of Nitrogenase (enzyme) helps convert nitrogen to ammonia, reflecting the evolution of ocean composition.
30:55 - Stages 6-10: Co-evolution of geosphere + biosphere >4,600 mineral species
"Changes in Earth's atmospheric composition at ~2.4 to 2.2 billion years ago represent the single most significant factor in our planet's mineralogical diversity."
31:30 - Considering difference between surface and subsurface evolution
Underground hydrology - evidence within Mo & Re in Molybdenite
32:50 - Golden et al. (2013) - Results: MoS2 Through Time
33:15 - There were two different significant Oxygen events.
34:00 - "Hypothesis: There was a protracted "Great Subsurface Oxidation Interval" that postdate the GOE by a billion years. This interval was the single most significant factor in Earth's mineralogical diversification."
34:15 - Stage 8: The "Intermediate Ocean" - 1.85-0.85 billion years ago
Oxidized surface ocean; deep-ocean anoxia - Sulfate-reducing microbes
Things going on subsurface that were not happening at the surface.
35:10 - Stage 9: Snowball Earth - Neoproterozoic Oxidation
0.85 to 0.542 million years ago
0.85 to 0.542 million years ago
Glacial cycles triggered by albedo feedback.
>4,600 mineral species (few new species)
36:29 - Stage 10: Phanerozoic Biomineralization - >0.542 billion years old
Rise of our terrestrial biosphere
>4,800 mineral species - biominerals, clays
carbonate
hazenite
silica
calcite
>50 Organic mineral species
37:30 - Considering the engineering marvel of calcite Trilobite Eyes.
38:40 - Formation of soils - fossilized in Rhynie Chert ~0.410 million years ago
Earth's terrestrial surface before >0.45 million years ago was barren.
(note: It was a world sculpted only by tectonics, tides, winds, gravity, and temperature.)
40:00 - Roots: The rise of the Terrestrial Biosphere
Clays
Rivers
Clouds
Fungi
Microbes
Worms
40:30 - Recent Conclusions
Previously unrecognized patterns in the distribution of minerals through Earth history reflect:
* Metal ore formation and the supercontinent cycle
* Changing ocean chemistry
* The rise of the terrestrial biosphere
41:00 - drifting plates and 5 Supercontinent Cycles
Evidence - The distribution of zircon crystal through time correlates with the supercontinent cycle over the past 3 billion years. - Condie, Aster (2010) - Hawkesworth et al. (2010)
Explaining why zircon is a such a reliable time keeper.
Crystal clear: How one tiny grain of zircon can tell us so much about our planet
____________________________________________________________
Zircon Chronology: Dating the Oldest Material on Earth
____________________________________________________________
"Zircon Recrystallization History as a Function of the U-Content and Its Geochronologic Implications: Empirical Facts on Zircons from Romanian Carpathians and Dobrogea"
Ioan Coriolan Balintoni and Constantin Balica (2012)
41:40 - What the formation pulses tell us -
Boron and Beryllium minerals - Grew, Hazen (2009, 2010)
42:00 - Mercury (Hg) minerals - Hazen et al. (2012) - but why the gap? -
Why the spike? (that occurs at the same time as maximum coal deposition.)
Mercury and other heavy minerals loosely bind to coal during formation.
43:40 - Mercury minerals and the rise of the Terrestrial Biosphere
44:00 - Conclusions: Earth has transformed repeatedly evolving over the 4.5 billion years, and it continues to change today. Life and rocks have co-evolved as a consequence of many positively and negative feedbacks.
45:00 - Q/A
==========================================================
About Dr. Robert M. Hazen
Biography
Robert M. Hazen — May 2010
Robert M. Hazen, research scientist at the Carnegie Institution of Washington’s Geophysical Laboratory and Clarence Robinson Professor of Earth Science at George Mason University, received the B.S. and S.M. in geology at the Massachusetts Institute of Technology (1971), and the Ph.D. at Harvard University in earth science (1975). After studies as NATO Postdoctoral Fellow at Cambridge University in England, he joined the Carnegie Institution’s research effort.
Hazen is author of more than 350 articles and 20 books on science, history, and music. A Fellow of the American Association for the Advancement of Science, he has received the Mineralogical Society of America Award (1982), the American Chemical Society Ipatieff Prize (1986), the ASCAP Deems Taylor Award (1989), the Educational Press Association Award (1992), the Elizabeth Wood Science Writing Award (1998), and the Distinguished Public Service Medal of the Mineralogical Society of America (2009).
He has presented numerous named lectures at universities, and is currently Sigma Xi Distinguished Lecturer (2008-2010). He served as Distinguished Lecturer for the Mineralogical Society of America, and is a Past President of the Society. Hazen’s recent research focuses on the role of minerals in the origin of life, including such processes as mineral-catalyzed organic synthesis and the selective adsorption of organic molecules on mineral surfaces. He has also developed a new approach to mineralogy, called “mineral evolution,” which explores the co-evolution of the geo- and biospheres.
In addition to his mineralogical research, he is Principal Investigator of the Deep Carbon Observatory (http://dco.ciw.edu), which is a 10-year international effort to achieve fundamental advances in understanding the chemical and biological roles of carbon in Earth’s interior. ...
______________________________________________________
THE STORY OF EARTH
GREAT IDEAS OF SCIENCE: A READER
SCIENCE MATTERS, 2ND EDITION.
THE SCIENCES: AN INTEGRATED APPROACH, 5TH EDITION
THE SCIENCES: AN INTEGRATED APPROACH, 6TH EDITION.
_______________________________________________________
The Great Courses audio lecture series:
The evolution of minerals has played a central role all across the surface of the planet and throughout its interior. In The Origin and Evolution of Earth: From the Big Bang to the Future of Human Existence, experience the thrill of piecing together this story in an enlightening new perspective. In 48 lectures by Professor Robert M. Hazen, the noted scientist who pioneered the study of mineral evolution, you...
This course provides a clear and bracing overview of the entire scientific world from the laws of motion first formulated 300 years ago by Sir Isaac Newton to the latest marvels of contemporary genetic research. These lucid, information-packed lectures convey the excitement of scientific discovery and trace the connections between discoveries over time. Veteran science educator Professor Robert Hazen renders the...
Four billion years ago, the infant Earth was a seething cauldron of erupting volcanoes, raining meteors, and hot noxious gases, totally devoid of life. But a relatively short time later-100 million to 200 million years-the planet was teeming with primitive organisms. What happened? Professor Robert M. Hazen, one of the nation's foremost science educators and a leader of a NASA-supported team that is studying the…
_________________________________________________________________
Index:
Index:
Wednesday, January 6, 2016
{1} Our Global Heat and Moisture Distribution Engine
Saturday, January 9, 2016
{2} Co-evolution of Minerals and Life | Dr Robert Hazen
Thursday, January 14, 2016
{3} Evolution of Carbon and our biosphere - Professor Hazen focuses on the element Carbon
Saturday, January 23, 2016
{4} Evolution-Considering Deep Time and a Couple Big Breaks
Saturday, February 6, 2016
{5a} The Most Beautiful Graph on Earth - A. Hessler
Sunday, February 7, 2016
{5b} Earth's Earliest Climate - By Angela Hessler
Sunday, February 14, 2016
{6} Evolution of Earth's Atmosphere - easy version
Thursday, February 18, 2016
{7} Our Global Heat and Moisture Distribution Engine, visualized
Friday, February 19, 2016
{8} Atmospheric Insulation Explained - appreciating our climate engine
2 comments:
hi Robert-
I see we have another common interest besides diamond synthesis !
I've been a fan of Robert Hazen and his ability to explain the exploration of deep evolution for many years.
Glad you liked it Russell.
Cheers, Peter
:- )
Post a Comment